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de Ree V, Nath TC, Barua P, Harbecke D, Lee D, Rödelsperger C, Streit A. Genomic analysis of Strongyloides stercoralis and Strongyloides fuelleborni in Bangladesh. PLoS Negl Trop Dis 2024; 18:e0012440. [PMID: 39226300 PMCID: PMC11407627 DOI: 10.1371/journal.pntd.0012440] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 09/17/2024] [Accepted: 08/07/2024] [Indexed: 09/05/2024] Open
Abstract
BACKGROUND About 600 million people are estimated to be infected with Strongyloides stercoralis, the species that causes most of the human strongyloidiasis cases. S. stercoralis can also infect non-human primates (NHPs), dogs and cats, rendering these animals putative sources for zoonotic human S. stercoralis infection. S. fuelleborni is normally found in old world NHPs but occasionally also infects humans, mainly in Africa. Dogs in southeast Asia carry at least two types of Strongyloides, only one of which appears to be shared with humans ("dog only" and "human and dog" types). For S. stercoralis with molecular taxonomic information, there is a strong sampling bias towards southeast and east Asia and Australia. METHODOLOGY/PRINCIPLE FINDINGS In order to extend the geographic range of sampling, we collected human and dog derived Strongyloides spp. and hookworms from two locations in Bangladesh and subjected them to molecular taxonomic and genomic analysis based on nuclear and mitochondrial sequences. All hookworms found were Necator americanus. Contrary to earlier studies in Asia, we noticed a rather high incidence of S. fuelleborni in humans. Also in this study, we found the two types of S. stercoralis and no indication for genetic isolation from the southeast Asian populations. However, we found one genomically "dog only" type S. stercoralis in a human sample and we found two worms in a dog sample that had a nuclear genome of the "dog only" but a mitochondrial genome of the "human and dog" type. CONCLUSIONS/SIGNIFICANCE S. fuelleborni may play a more prominent role as a human parasite in certain places in Asia than previously thought. The introgression of a mitochondria haplotype into the "dog only" population suggests that rare interbreeding between the two S. stercoralis types does occur and that exchange of genetic properties, for example a drug resistance, between the two types is conceivable.
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Affiliation(s)
- Veroni de Ree
- Department of Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, Germany
| | | | | | - Dorothee Harbecke
- Department of Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, Germany
| | - Dongmin Lee
- International Parasite Resource Bank, Chungbuk National University, Seowon-gu, Korea
| | - Christian Rödelsperger
- Department of Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, Germany
| | - Adrian Streit
- Department of Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, Germany
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Pomari E, Orza P, Bernardi M, Fracchetti F, Campedelli I, De Marta P, Recchia A, Paradies P, Buonfrate D. A Pilot Study for the Characterization of Bacillus spp. and Analysis of Possible B. thuringiensis/ Strongyloides stercoralis Correlation. Microorganisms 2024; 12:1603. [PMID: 39203445 PMCID: PMC11356623 DOI: 10.3390/microorganisms12081603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2024] [Revised: 07/31/2024] [Accepted: 08/02/2024] [Indexed: 09/03/2024] Open
Abstract
Differentiating between Bacillus species is relevant in human medicine. Bacillus thuringiensis toxins might be effective against Strongyloides stercoralis, a nematode causing relevant human morbidity. Our first objective was to evaluate genomic and MALDI-TOF identification methods for B. thuringiensis. Our secondary objective was to evaluate a possible negative selection pressure of B. thuringiensis against S. stercoralis. PCR and Sanger were compared to MALDI-TOF on a collection of 44 B. cereus group strains. B. thuringiensis toxin genes were searched on 17 stool samples from S. stercoralis-infected and uninfected dogs. Metagenomic 16S rRNA was used for microbiome composition. The inter-rate agreement between PCR, Sanger, and MALDI-TOF was 0.631 k (p-value = 6.4 × 10-10). B. thuringiensis toxins were not found in dogs' stool. Bacteroidota and Bacillota were the major phyla in the dogs' microbiome (both represented >20% of the total bacterial community). Prevotella was underrepresented in all Strongyloides-positive dogs. However, the general composition of bacterial communities was not significantly linked with S. stercoralis infection. The genomic methods allowed accurate differentiation between B. thuringiensis and B. cereus. There was no association between B. thuringiensis and S. stercoralis infection, but further studies are needed to confirm this finding. We provide the first descriptive results about bacterial fecal composition in dogs with S. stercoralis infection.
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Affiliation(s)
- Elena Pomari
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy; (P.O.); (M.B.); (D.B.)
| | - Pierantonio Orza
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy; (P.O.); (M.B.); (D.B.)
| | - Milena Bernardi
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy; (P.O.); (M.B.); (D.B.)
| | - Fabio Fracchetti
- Microbion srl, San Giovanni Lupatoto, 37057 Verona, Italy; (F.F.); (I.C.); (P.D.M.)
| | - Ilenia Campedelli
- Microbion srl, San Giovanni Lupatoto, 37057 Verona, Italy; (F.F.); (I.C.); (P.D.M.)
| | - Patrick De Marta
- Microbion srl, San Giovanni Lupatoto, 37057 Verona, Italy; (F.F.); (I.C.); (P.D.M.)
| | - Alessandra Recchia
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), Veterinary Section, University of Bari “Aldo Moro”, Valenzano, 70010 Bari, Italy; (A.R.); (P.P.)
| | - Paola Paradies
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), Veterinary Section, University of Bari “Aldo Moro”, Valenzano, 70010 Bari, Italy; (A.R.); (P.P.)
| | - Dora Buonfrate
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar di Valpolicella, 37024 Verona, Italy; (P.O.); (M.B.); (D.B.)
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Kirkwood N, Šlapeta J. Strongyloides stercoralis in two dogs from a household in temperate Australia. Aust Vet J 2024; 102:369-373. [PMID: 38506222 DOI: 10.1111/avj.13330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 02/08/2024] [Accepted: 03/04/2024] [Indexed: 03/21/2024]
Abstract
Strongyloides stercoralis is parasite affecting both humans and dogs and is most prevalent in tropical and subtropical areas of Australia. This case report describes two dogs from a household in Sydney, New South Wales, one with chronic gastrointestinal signs and the other who was asymptomatic who were subsequently diagnosed with S. stercoralis. Diagnosis can be challenging in humans and dogs due to intermittent shedding and low worm burdens and in this case the symptomatic dog had Strongyloides spp. rhabitiform larvae detected on a direct faecal smear and PCR, the asymptomatic dog on PCR only. Obtained sequences from the symptomatic dog confirmed the presence of the S. stercoralis clade affecting both dogs and humans. Infection does not respond to commonly used deworming drugs for dogs. Treatment in both cases was undertaken using off-label doses of ivermectin and follow-up PCR testing was negative. This case report should increase practitioner awareness of this parasite as present and transmissible in temperate areas of Australia.
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Affiliation(s)
- N Kirkwood
- Sydney School of Veterinary Science, Faculty of Science, University of Sydney, Sydney, New South Wales, Australia
| | - J Šlapeta
- Sydney School of Veterinary Science, Faculty of Science, University of Sydney, Sydney, New South Wales, Australia
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Nosková E, Svobodová V, Hypská V, Cerezo-Echevarria A, Kurucová T, Ilík V, Modrý D, Pafčo B. High-throughput sequencing of Strongyloides stercoralis - a fatal disseminated infection in a dog. Parasitology 2024; 151:587-593. [PMID: 38800868 DOI: 10.1017/s0031182024000568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
The rhabditid nematode Strongyloides stercoralis is known worldwide as the causative agent of strongyloidiasis in humans. In addition to public health concerns, S. stercoralis also infects dogs, which represent a possible reservoir for potentially zoonotic transmissions. We describe the first confirmed case of fatal disseminated infection in a dog in the Czech Republic. The microscopic and histological results were supported by a complex genotyping approach. Using high-throughput sequencing of the hypervariable region (HVR-IV) of 18S rDNA and Sanger sequencing of the partial cytochrome c oxidase subunit 1 gene (cox1), the potentially zoonotic haplotype/lineage A of S. stercoralis was confirmed, while the solely canine haplotype/lineage B was not found. The development of the disease is mainly associated with immunodeficiency, and in this case, it was triggered by inappropriate treatment, in particular the use of corticosteroids.
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Affiliation(s)
- Eva Nosková
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
- Institute of Vertebrate Biology, Czech Academy of Sciences, Květná 8, 603 00 Brno, Czech Republic
| | - Vlasta Svobodová
- Department of Pathology and Parasitology, University of Veterinary Sciences Brno, Palackého třída 1946/1, 612 42, Brno, Czech Republic
| | - Vilma Hypská
- Veterinary centrum VIVA, Medkova 6, 500 02 Hradec Králové, Czech Republic
| | | | - Terézia Kurucová
- Central European Institute of Technology, Masaryk University, Kamenice 753/5, 625 00 Brno, Czech Republic
| | - Vladislav Ilík
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
- Institute of Vertebrate Biology, Czech Academy of Sciences, Květná 8, 603 00 Brno, Czech Republic
| | - David Modrý
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
- Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00 Prague, Czech Republic
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, Branišovská 31, 370 05 České Budějovice, Czech Republic
| | - Barbora Pafčo
- Institute of Vertebrate Biology, Czech Academy of Sciences, Květná 8, 603 00 Brno, Czech Republic
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Jitsamai W, Kamkong P, Traub RJ, Taweethavonsawat P. New insight into genetic diversity of zoonotic-potential Ancylostoma ceylanicum in stray cats living in Bangkok, Thailand, based on deep amplicon sequencing. Zoonoses Public Health 2024; 71:236-247. [PMID: 38053474 DOI: 10.1111/zph.13102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 08/25/2023] [Accepted: 11/25/2023] [Indexed: 12/07/2023]
Abstract
AIMS This study aimed to characterize feline hookworms from stray cats living in Bangkok. METHODS AND RESULTS A total of 56 hookworm-positive faecal samples were identified for hookworm species by using PCR targeting the ITS1, 5.8S, and ITS2 fragment and qPCR targeting ITS2. Of 56 samples, 96.4% (54/56) were identified as Ancylostoma ceylanicum and 1.8% (1/56) as Ancylostoma caninum. With qPCR, 89.3% (50/56) were identified as single A. ceylanicum infection and 5.4% (3/56) as coinfection of A. ceylanicum and A. caninum. For genetic characterization of A. ceylanicum, 10 samples were pooled, and the partial COI gene was amplified, followed by deep amplicon sequencing. Five pooled samples were analysed, and 99.73% were identified with A. ceylanicum sequences, which were allocated into 19 haplotypes (AC01-AC19). Genetic diversity findings for A. ceylanicum in Asia revealed that three of eight haplotypes considered of zoonotic significance occurred in humans, dogs, and cats, including haplotypes H01, H20, and H21. The predominant haplotype in this study, AC01, was clustered with H01-a zoonotic haplotype. CONCLUSIONS The diversity obtained by deep amplicon sequencing supported that the A. ceylanicum community had high genetic variation. Deep amplicon sequencing was a useful method to determine source, zoonotic potential, and host-parasite relationship.
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Affiliation(s)
- Wanarit Jitsamai
- Parasitology Unit, Department of Veterinary Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
- Department of Parasitology and Entomology, Faculty of Public Health, Mahidol University, Bangkok, Thailand
| | - Patchana Kamkong
- Parasitology Unit, Department of Veterinary Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
| | - Rebecca J Traub
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Piyanan Taweethavonsawat
- Parasitology Unit, Department of Veterinary Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, Thailand
- Biomarkers in Animal Parasitology Research Group, Chulalongkorn University, Bangkok, Thailand
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Colella A, Buonfrate D, Lo Tempio F, Digiaro S, Recchia A, Greco B, Paradies P. Clinical insights to address canine strongyloidosis in daily practice. Top Companion Anim Med 2024; 60:100845. [PMID: 38184143 DOI: 10.1016/j.tcam.2024.100845] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Revised: 11/02/2023] [Accepted: 01/02/2024] [Indexed: 01/08/2024]
Abstract
Canine strongyloidosis by Strongyloides stercoralis is a parasitic disease emerging in Europe, which represents both a veterinary clinical issue and a public health challenge because of the zoonotic potential. The disease, not yet frequent in Europe, could induce severe clinical signs in dogs; thus, an early diagnosis and appropriate treatment are desirable. The aim of the present work is to retrospectively investigate the clinical and paraclinical findings in sick dogs naturally infected by S. stercoralis, with particular attention to ultrasound (US) changes at the gastrointestinal level. Twelve dogs were included in the study. The diagnosis was made by means of larval morphological identification on faecal samples and PCR. Most dogs presented with gastrointestinal signs; diarrhea and weight loss were the most common presenting complaint. Only one dog showed respiratory signs, associated to a parasitic cutaneous nodule. Hypoproteinaemia, anaemia, leucocytosis and an increase in alpha2-globulin fraction at serum protein electrophoresis were common (>50%) but not constant findings. The most reported US picture was a fluid-filled, distended, atonic small intestine mostly associated with altered wall layering, while the wall thickness commonly associated with chronic enteritis was only rarely reported. These changes, associated with other clinical and paraclinical alterations, could increase the suspicion of canine strongyloidosis and may direct clinicians to include strongyloidosis in the differential diagnosis of dogs with diarrhea. The histological examination at the intestinal level, available in five dogs, revealed the presence of parasites from the full-thickness biopsy, but not from the endoscopic biopsy. The critical points of diagnosis in clinical practice are also discussed.
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Affiliation(s)
- Antonella Colella
- University of Bari, Department of Precision and Regenerative Medicine and Ionian Area, Section of Veterinary Clinics and Animal Production, S.p. Valenzano-Casamassima Km 3, 70010, Valenzano, (BA), Italy
| | - Dora Buonfrate
- IRCCS Sacro Cuore Don Calabria Hospital, Negrar, 37024, Verona, Italy
| | - Federica Lo Tempio
- University of Bari, Department of Precision and Regenerative Medicine and Ionian Area, Section of Veterinary Clinics and Animal Production, S.p. Valenzano-Casamassima Km 3, 70010, Valenzano, (BA), Italy
| | - Serena Digiaro
- University of Bari, Department of Precision and Regenerative Medicine and Ionian Area, Section of Veterinary Clinics and Animal Production, S.p. Valenzano-Casamassima Km 3, 70010, Valenzano, (BA), Italy
| | - Alessandra Recchia
- University of Bari, Department of Precision and Regenerative Medicine and Ionian Area, Section of Veterinary Clinics and Animal Production, S.p. Valenzano-Casamassima Km 3, 70010, Valenzano, (BA), Italy
| | - Beatrice Greco
- University of Bari, Department of Precision and Regenerative Medicine and Ionian Area, Section of Veterinary Clinics and Animal Production, S.p. Valenzano-Casamassima Km 3, 70010, Valenzano, (BA), Italy
| | - Paola Paradies
- University of Bari, Department of Precision and Regenerative Medicine and Ionian Area, Section of Veterinary Clinics and Animal Production, S.p. Valenzano-Casamassima Km 3, 70010, Valenzano, (BA), Italy.
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Beiromvand M, Ashiri A, de Ree V, Harbecke D, Rödelsperger C, Streit A, Rafiei A. Strongyloides stercoralis genotyping in a human population in southwestern Iran. Parasit Vectors 2024; 17:21. [PMID: 38229164 DOI: 10.1186/s13071-023-06103-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 12/17/2023] [Indexed: 01/18/2024] Open
Abstract
BACKGROUND Strongyloidiasis is a neglected tropical disease (NTD) that is caused mainly by Strongyloides stercoralis, with an estimated 600 million people infected worldwide, and in fewer cases by Strongyloides fuelleborni fuelleborni and Strongyloides fuelleborni kellyi. A number of studies have been conducted on the genetic diversity of S. stercoralis in East and Southeast Asia; however, there is very limited corresponding information from West Asian countries, including Iran. METHODS For Strongyloides worms collected from patients in southwestern Iran, the hypervariable regions I (HVR-I) and IV (HVR-IV) of the nuclear 18S ribosomal DNA (rDNA) locus (SSU) and a fragment of the subunit 1 mitochondrial cytochrome c oxidase gene (cox-1) were sequenced. For a subset of the worms, whole-genome sequencing data were generated. RESULTS The cox-1 sequences of 136 worms isolated from 23 patients indicated that all isolates were S. stercoralis. Among the cox-1 sequences, 33 polymorphic sites and 13 haplotypes were found. The phylogenetic analysis demonstrated that some sequences clustered fairly closely with sequences from humans and dogs from other parts of the world, while others formed a separate, Iran-specific group. Among 64 S. stercoralis analyzed, we found three of the previously described SSU HVR-I haplotypes, with haplotype II being the most frequent haplotype. In contrast to Southeast Asia, where S. stercoralis heterozygous for different haplotypes at the HVR-I locus are rare, we found 20 worms to be heterozygous for two different HVR-I haplotypes, 18 of which fell into the Iran-specific cox-1 cluster. SSU-heterozygous worms also showed elevated heterozygosity at the whole-genome level. CONCLUSIONS We conclude that the S. stercoralis population from the Khuzestan province shares much of the genetic diversity with the population in Southeast Asia, but there is an indication of additional genetic input. There appears to be some population structure with different subpopulations, which however do interbreed at least occasionally.
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Affiliation(s)
- Molouk Beiromvand
- Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
- Department of Parasitology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
| | - Alireza Ashiri
- Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
- Department of Parasitology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Veroni de Ree
- Department of Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, Baden‑Württemberg, Germany
| | - Dorothee Harbecke
- Department of Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, Baden‑Württemberg, Germany
| | - Christian Rödelsperger
- Department of Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, Baden‑Württemberg, Germany
| | - Adrian Streit
- Department of Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, Baden‑Württemberg, Germany.
| | - Abdollah Rafiei
- Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
- Department of Parasitology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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Nosková E, Sambucci KM, Petrželková KJ, Červená B, Modrý D, Pafčo B. Strongyloides in non-human primates: significance for public health control. Philos Trans R Soc Lond B Biol Sci 2024; 379:20230006. [PMID: 38008123 PMCID: PMC10676817 DOI: 10.1098/rstb.2023.0006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 09/18/2023] [Indexed: 11/28/2023] Open
Abstract
Primates are an important source of infectious disease in humans. Strongyloidiasis affects an estimated 600 million people worldwide, with a global distribution and hotspots of infection in tropical and subtropical regions. Recently added to the list of neglected tropical diseases, global attention has been demanded in the drive for its control. Through a literature review of Strongyloides in humans and non-human primates (NHP), we analysed the most common identification methods and gaps in knowledge about this nematode genus. The rise of molecular-based methods for Strongyloides detection is evident in both humans and NHP and provides an opportunity to analyse all data available from primates. Dogs were also included as an important host species of Strongyloides and a potential bridge host between humans and NHP. This review highlights the lack of molecular data across all hosts-humans, NHP and dogs-with the latter highly underrepresented in the database. Despite the cosmopolitan nature of Strongyloides, there are still large gaps in our knowledge for certain species when considering transmission and pathogenicity. We suggest that a unified approach to Strongyloides detection be taken, with an optimized, repeatable molecular-based method to improve our understanding of this parasitic infection. This article is part of the Theo Murphy meeting issue 'Strongyloides: omics to worm-free populations'.
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Affiliation(s)
- Eva Nosková
- Institute of Vertebrate Biology, Czech Academy of Sciences, 603 00 Brno, Czech Republic
- Department of Botany and Zoology, Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
| | - Kelly M. Sambucci
- Institute of Vertebrate Biology, Czech Academy of Sciences, 603 00 Brno, Czech Republic
- Department of Anthropology, Faculty of Science, Masaryk University, 611 37 Brno, Czech Republic
| | - Klára J. Petrželková
- Institute of Vertebrate Biology, Czech Academy of Sciences, 603 00 Brno, Czech Republic
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 370 05 České Budějovice, Czech Republic
| | - Barbora Červená
- Institute of Vertebrate Biology, Czech Academy of Sciences, 603 00 Brno, Czech Republic
| | - David Modrý
- Department of Botany and Zoology, Faculty of Science, Masaryk University, 625 00 Brno, Czech Republic
- Institute of Parasitology, Biology Centre, Czech Academy of Sciences, 370 05 České Budějovice, Czech Republic
- Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, 165 00 Prague, Czech Republic
| | - Barbora Pafčo
- Institute of Vertebrate Biology, Czech Academy of Sciences, 603 00 Brno, Czech Republic
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Al-Jawabreh R, Lastik D, McKenzie D, Reynolds K, Suleiman M, Mousley A, Atkinson L, Hunt V. Advancing Strongyloides omics data: bridging the gap with Caenorhabditis elegans. Philos Trans R Soc Lond B Biol Sci 2024; 379:20220437. [PMID: 38008117 PMCID: PMC10676819 DOI: 10.1098/rstb.2022.0437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Accepted: 08/31/2023] [Indexed: 11/28/2023] Open
Abstract
Among nematodes, the free-living model organism Caenorhabditis elegans boasts the most advanced portfolio of high-quality omics data. The resources available for parasitic nematodes, including Strongyloides spp., however, are lagging behind. While C. elegans remains the most tractable nematode and has significantly advanced our understanding of many facets of nematode biology, C. elegans is not suitable as a surrogate system for the study of parasitism and it is important that we improve the omics resources available for parasitic nematode species. Here, we review the omics data available for Strongyloides spp. and compare the available resources to those for C. elegans and other parasitic nematodes. The advancements in C. elegans omics offer a blueprint for improving omics-led research in Strongyloides. We suggest areas of priority for future research that will pave the way for expansions in omics resources and technologies. This article is part of the Theo Murphy meeting issue 'Strongyloides: omics to worm-free populations'.
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Affiliation(s)
- Reem Al-Jawabreh
- Department of Life Sciences, University of Bath, Bath, BA2 7AY, UK
| | - Dominika Lastik
- Department of Life Sciences, University of Bath, Bath, BA2 7AY, UK
| | | | - Kieran Reynolds
- Department of Life Sciences, University of Bath, Bath, BA2 7AY, UK
| | - Mona Suleiman
- Department of Life Sciences, University of Bath, Bath, BA2 7AY, UK
| | | | | | - Vicky Hunt
- Department of Life Sciences, University of Bath, Bath, BA2 7AY, UK
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10
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Ross K. Locally acquired strongyloidiasis in remote Australia: why are there still cases? Philos Trans R Soc Lond B Biol Sci 2024; 379:20220435. [PMID: 38008121 PMCID: PMC10676813 DOI: 10.1098/rstb.2022.0435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 03/20/2023] [Indexed: 11/28/2023] Open
Abstract
In Australia, strongyloidiasis primarily affects returned travellers, Vietnam veterans and refugees or asylum seekers, and First Nations people. Non-overseas acquired cases are seen almost exclusively in Australian First Nations remote communities. Australian First Nations communities have one of the highest rates of strongyloidiasis in the world. Our work has shown that strongyloidiasis is a disease of poverty. Acknowledging this is important-we need to shift the lens to socioeconomic factors, particularly environmental health hardware such as working toilets and sewerage systems, showers and laundries, and effective wastewater and rubbish removal. The rates of strongyloidiasis in First Nations communities is a result of decades of inadequate, poorly constructed and/or poorly maintained housing, and poor environmental health hardware (hereafter hardware). The solution lies in adequate funding, resulting in well designed and maintained housing and appropriate hardware. Governments need to allow First Nations communities themselves to take the lead role in funding allocation, and design, construction and maintenance of their housing and hardware. This will ensure housing and hardware fulfils cultural and physical needs and desires, and protects health. Improving housing and hardware will also improve other health outcomes. This article is part of the Theo Murphy meeting issue 'Strongyloides: omics to worm-free populations'.
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Affiliation(s)
- Kirstin Ross
- Environmental Health, Flinders University, GPO Box 2100, Adelaide, South Australia 5001, Australia
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Bryant AS, Akimori D, Stoltzfus JDC, Hallem EA. A standard workflow for community-driven manual curation of Strongyloides genome annotations. Philos Trans R Soc Lond B Biol Sci 2024; 379:20220443. [PMID: 38008112 PMCID: PMC10676816 DOI: 10.1098/rstb.2022.0443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 07/18/2023] [Indexed: 11/28/2023] Open
Abstract
Advances in the functional genomics and bioinformatics toolkits for Strongyloides species have positioned these species as genetically tractable model systems for gastrointestinal parasitic nematodes. As community interest in mechanistic studies of Strongyloides species continues to grow, publicly accessible reference genomes and associated genome annotations are critical resources for researchers. Genome annotations for multiple Strongyloides species are broadly available via the WormBase and WormBase ParaSite online repositories. However, a recent phylogenetic analysis of the receptor-type guanylate cyclase (rGC) gene family in two Strongyloides species highlights the potential for errors in a large percentage of current Strongyloides gene models. Here, we present three examples of gene annotation updates within the Strongyloides rGC gene family; each example illustrates a type of error that may occur frequently within the annotation data for Strongyloides genomes. We also extend our analysis to 405 previously curated Strongyloides genes to confirm that gene model errors are found at high rates across gene families. Finally, we introduce a standard manual curation workflow for assessing gene annotation quality and generating corrections, and we discuss how it may be used to facilitate community-driven curation of parasitic nematode biodata. This article is part of the Theo Murphy meeting issue 'Strongyloides: omics to worm-free populations'.
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Affiliation(s)
- Astra S. Bryant
- Department of Physiology and Biophysics, University of Washington, Seattle, WA 98195, USA
- Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, CA 90095, USA
| | - Damia Akimori
- Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, CA 90095, USA
- Molecular Biology Interdepartmental PhD Program, University of California, Los Angeles, CA 90095, USA
| | | | - Elissa A. Hallem
- Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, CA 90095, USA
- Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA
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12
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Bradbury RS, Streit A. Is strongyloidiasis a zoonosis from dogs? Philos Trans R Soc Lond B Biol Sci 2024; 379:20220445. [PMID: 38008118 PMCID: PMC10676807 DOI: 10.1098/rstb.2022.0445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 08/29/2023] [Indexed: 11/28/2023] Open
Abstract
Strongyloides stercoralis infection remains a major veterinary and public health challenge globally. This chronic and potentially lifelong disease has fatal outcomes in immunosuppressed people and dogs. Currently, the role of dogs in the transmission cycle of human strongyloidiasis remains enigmatic. While zoonotic transmission to humans from companion animals has been proposed, this has not been confirmed. Modern molecular methods have allowed greater opportunity to explore the genotypes of S. stercoralis in dogs and humans. Work thus far has demonstrated that at least two distinct lineages exist, one apparently confined to canine hosts and one found in canine, feline, human and non-human primate hosts. Although genotyping of dog and human isolates from the same village has demonstrated identical genotypes in both species, coprophagia of human waste by dogs confounds interpretation. It remains unclear if dogs act as a zoonotic reservoir for human infection, or vice versa, or if this occurs only in some regions of the world and not in others. These questions must be answered before effective control strategies for strongyloidiasis can be instituted. This review explores the evidence for and against cross-species transmission of S. stercoralis between dogs and humans and summarizes future directions for research in this area. This article is part of the Theo Murphy meeting Issue 'Strongyloides: omics to worm-free populations'.
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Affiliation(s)
- Richard S. Bradbury
- School of Health and Life Sciences, Federation University, Melbourne, Victoria 3806, Australia
| | - Adrian Streit
- Department for Integrative Evolutionary Biology, Max Planck Institute for Biology Tübingen, Tübingen, 72076, Germany
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13
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Buonfrate D, Bradbury RS, Watts MR, Bisoffi Z. Human strongyloidiasis: complexities and pathways forward. Clin Microbiol Rev 2023; 36:e0003323. [PMID: 37937980 PMCID: PMC10732074 DOI: 10.1128/cmr.00033-23] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 08/11/2023] [Indexed: 11/09/2023] Open
Abstract
Strongyloidiasis is a World Health Organization neglected tropical disease usually caused by Strongyloides stercoralis, a parasitic worm with a complex life cycle. Globally, 300-600 million people are infected through contact with fecally contaminated soil. An autoinfective component of the life cycle can lead to chronic infection that may be asymptomatic or cause long-term symptoms, including malnourishment in children. Low larval output can limit the sensitivity of detection in stool, with serology being effective but less sensitive in immunocompromise. Host immunosuppression can trigger catastrophic, fatal hyperinfection/dissemination, where large numbers of larvae pierce the bowel wall and disseminate throughout the organs. Stable disease is effectively treated by single-dose ivermectin, with disease in immunocompromised patients treated with multiple doses. Strategies for management include raising awareness, clarifying zoonotic potential, the development and use of effective diagnostic tests for epidemiological studies and individual diagnosis, and the implementation of treatment programs with research into therapeutic alternatives and medication safety.
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Affiliation(s)
- Dora Buonfrate
- Department of Infectious Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy
| | - Richard S. Bradbury
- School of Health and Life Sciences, Federation University Australia, Berwick, Victoria, Australia
| | - Matthew R. Watts
- Centre for Infectious Diseases and Microbiology, Institute of Clinical Pathology and Medical Research – New South Wales Health Pathology and Sydney Institute for Infectious Diseases, Westmead Hospital, University of Sydney, Sydney, New South Wales, Australia
| | - Zeno Bisoffi
- Department of Infectious Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy
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14
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Paradies P, Digiaro S, Colella A, Greco B, Recchia A, Prato MG, Mazzi C, Losurdo G, Di Leo A, Formenti F, Buonfrate D. Strongyloidiasis in humans and dogs in Southern Italy: an observational study. Parasitol Res 2023; 122:2885-2890. [PMID: 37735273 PMCID: PMC10667409 DOI: 10.1007/s00436-023-07978-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 09/14/2023] [Indexed: 09/23/2023]
Abstract
Strongyloidiasis is a clinical issue both in humans and in dogs. Moreover, there are concerns about its zoonotic potential. We aimed to explore Strongyloides stercoralis epidemiology in Southern Italy in humans and dogs sharing the same environment in three different settings: (1) kennels (group K); (2) livestock farms (group L) and (3) agricultural farms (group A). For humans, a commercial ELISA test was used for screening. RT-PCR on faecal samples was done for people testing positive or equivocal at serology. On dog's faecal samples, Baermann test and RT-PCR were performed. A total of 145 dogs and 139 persons were tested. Based on faecal tests in dogs and serology in humans, a S. stercoralis positivity of 4.1% and 6.5% was revealed, respectively. The sites where cases were found were different for animals and humans. In dogs the highest positivity was in group K (6.7% against 2% and 0% in L and A). Differently, in humans the proportion of positive results was similar between the groups (p = 0.883). Fifty percent (3/6) of positive dogs were healthy; the other dogs presented weight loss and/or diarrhoea. ELISA-positive persons (n=9) were all in health, but abdominal pain (37.5%), urticaria (22.2%) and asthma (22.2%) were reported, resolving after treatment with oral ivermectin 200 μg/kg. RT-PCR performed on 13 human faecal samples resulted negative. These findings suggest that strongyloidiasis is present in humans and dogs in Southern Italy, and screening in larger cohorts would be needed for more accurate estimates.
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Affiliation(s)
- Paola Paradies
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Valenzano, Bari, Italy
| | - Serena Digiaro
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Valenzano, Bari, Italy
| | - Antonella Colella
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Valenzano, Bari, Italy
| | - Beatrice Greco
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Valenzano, Bari, Italy
| | - Alessandra Recchia
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Valenzano, Bari, Italy
| | - Marco Giuseppe Prato
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy
| | - Cristina Mazzi
- Clinical Research Unit, IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy
| | - Giuseppe Losurdo
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Valenzano, Bari, Italy
| | - Alfredo Di Leo
- Department of Precision and Regenerative Medicine and Ionian Area (DiMePRe-J), University of Bari "Aldo Moro", Valenzano, Bari, Italy
| | - Fabio Formenti
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy
| | - Dora Buonfrate
- Department of Infectious, Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy.
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15
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Borrás P, Pérez MG, Repetto S, Barrera JP, Risso MG, Montoya A, Miró G, Fernandez F, Telesca L, Britton C, Ruybal P. First identification of Strongyloides stercoralis infection in a pet dog in Argentina, using integrated diagnostic approaches. Parasit Vectors 2023; 16:389. [PMID: 37891629 PMCID: PMC10605978 DOI: 10.1186/s13071-023-06022-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2023] [Accepted: 10/18/2023] [Indexed: 10/29/2023] Open
Abstract
BACKGROUND Strongyloides stercoralis is a soil-transmitted intestinal nematode with a complex life cycle that primarily affects humans, non-human primates, dogs, and occasionally cats. This study presents, to the best of our knowledge, the first case of S. stercoralis infection and its genotyping in a domestic dog from Argentina. METHODS The patient was a female wired-haired Teckel dog exhibiting recurrent coughing. Coproparasitological analysis using the Baermann technique revealed the presence of rhabditiform larvae morphologically compatible with S. stercoralis. To confirm this finding, molecular diagnosis (18S ribosomal RNA) and analysis of the cox1 gene were performed. RESULTS We identified a haplotype (HP20) that has previously only been related to S. stercoralis infection in dogs, but was found in the present study to be highly related to the haplotype (HP16) of a zoonotic variant and divergent from those previously described from human patients in Argentina. Furthermore, unlike in human cases following treatment with ivermectin, the dog was negative after moxidectin treatment according to polymerase chain reaction of the sampled faeces. CONCLUSIONS This case report shows the importance of further investigation into potential transmission events and prevalences of S. stercoralis in dogs and humans in South America. The results reported here should also encourage future work that examines different scenarios of infection with S. stercoralis in dogs and humans with the aim of integrating clinical management, diagnosis, treatment and follow-up strategies in the quest for new approaches for the treatment of this disease in animals and humans. The findings support the adoption of a One Health approach, which recognizes the interconnectedness between animal and human health, in addressing parasitic infections such as strongyloidiasis.
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Affiliation(s)
- Pablo Borrás
- Centro de Ciencias Veterinarias, Universidad Maimonides, Buenos Aires, Argentina.
| | - Matías Gastón Pérez
- School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Glasgow, UK
| | - Silvia Repetto
- Facultad de Medicina, Departamento de Microbiología, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
- Hospital de Clínicas "José de San Martín", Universidad de Buenos Aires, División Infectología, Buenos Aires, Argentina
| | - Juan Pedro Barrera
- Animal Health Department, Veterinary Faculty, Universidad Complutense de Madrid, Madrid, Spain
| | - Marikena Guadalupe Risso
- Facultad de Medicina, Departamento de Microbiología, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Ana Montoya
- Animal Health Department, Veterinary Faculty, Universidad Complutense de Madrid, Madrid, Spain
| | - Guadalupe Miró
- Animal Health Department, Veterinary Faculty, Universidad Complutense de Madrid, Madrid, Spain
| | | | - Laura Telesca
- Private Practice, Veterinaria a Domicilio, Buenos Aires, Argentina
| | - Collette Britton
- School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Glasgow, UK
| | - Paula Ruybal
- Facultad de Medicina, Departamento de Microbiología, Universidad de Buenos Aires, Buenos Aires, Argentina
- Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
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16
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Chan AHE, Thaenkham U. From past to present: opportunities and trends in the molecular detection and diagnosis of Strongyloides stercoralis. Parasit Vectors 2023; 16:123. [PMID: 37041645 PMCID: PMC10088203 DOI: 10.1186/s13071-023-05763-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Accepted: 03/30/2023] [Indexed: 04/13/2023] Open
Abstract
Strongyloides stercoralis is a soil-transmitted helminth that is mainly found in the tropical and subtropical regions and affects approximately 600 million people globally. The medical importance of strongyloidiasis lies in its capacity to remain asymptomatic and chronically unnoticed until the host is immunocompromised. Additionally, in severe strongyloidiasis, hyperinfection syndrome and larva dissemination to various organs can occur. Parasitological techniques such as Baermann-Moraes and agar plate culture to detect larvae in stool samples are the current gold standard. However, the sensitivity might be inadequate, especially with reduced worm burden. Complementing parasitological techniques, immunological techniques including immunoblot and immunosorbent assays are employed, with higher sensitivity. However, cross-reactivity to other parasites may occur, hampering the assay's specificity. Recently, advances in molecular techniques such as polymerase chain reaction and next-generation sequencing technology have provided the opportunity to detect parasite DNA in stool, blood, and environmental samples. Molecular techniques, known for their high sensitivity and specificity, have the potential to circumvent some of the challenges associated with chronicity and intermittent larval output for increased detection. Here, as S. stercoralis was recently included by the World Health Organization as another soil-transmitted helminth targeted for control from 2021 to 2030, we aimed to present a review of the current molecular techniques for detecting and diagnosing S. stercoralis in a bid to consolidate the molecular studies that have been performed. Upcoming molecular trends, especially next-generation sequencing technologies, are also discussed to increase the awareness of its potential for diagnosis and detection. Improved and novel detection methods can aid in making accurate and informed choices, especially in this era where infectious and non-infectious diseases are increasingly commonplace.
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Affiliation(s)
| | - Urusa Thaenkham
- Department of Helminthology, Mahidol University, Bangkok, Thailand
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17
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Richins T, Sapp SG, Ketzis JK, Willingham AL, Mukaratirwa S, Qvarnstrom Y, Barratt JL. Genetic characterization of Strongyloides fuelleborni infecting free-roaming African vervets ( Chlorocebus aethiops sabaeus) on the Caribbean island of St. Kitts. Int J Parasitol Parasites Wildl 2023; 20:153-161. [PMID: 36860205 PMCID: PMC9969202 DOI: 10.1016/j.ijppaw.2023.02.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/13/2023] [Accepted: 02/14/2023] [Indexed: 02/17/2023]
Abstract
Human strongyloidiasis is an important neglected tropical disease primarily caused by the nematode Strongyloides stercoralis, and to a lesser extent Strongyloides fuelleborni which mainly infects non-human primates. Zoonotic sources of infection have important implications for control and prevention of morbidity and mortality caused by strongyloidiasis. Recent molecular evidence suggests that for S. fuelleborni, primate host specificity is variable among genotypes across the Old World, and consequently that these types likely vary in their capacity for human spillover infections. Populations of free-roaming vervet monkeys (Chlorocebus aethiops sabaeus), introduced to the Caribbean Island of Staint Kitts from Africa, live in close contact with humans, and concern has arisen regarding their potential to serve as reservoirs of zoonotic infections. In this study, we sought to determine the genotypes of S. fuelleborni infecting St. Kitts vervets to explore whether they are potential reservoirs for human-infecting S. fuelleborni types. Fecal specimens were collected from St. Kitts vervets and S. fuelleborni infections were confirmed microscopically and by PCR. Strongyloides fuelleborni genotypes were determined from positive fecal specimens using an Illumina amplicon sequencing-based genotyping approach targeting the mitochondrial cox1 locus and 18S rDNA hypervariable regions I and IV of Strongyloides species. Phylogenetic analysis of resultant genotypes supported that S. fuelleborni from St. Kitts vervets is of an exclusively African variety, falling within the same monophyletic group as an isolate which has been detected previously in a naturally infected human from Guinea-Bissau. This observation highlights that St. Kitts vervets may serve as potential reservoirs for zoonotic S. fuelleborni infection, which warrants further exploration.
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Affiliation(s)
- Travis Richins
- Centers for Disease Control and Prevention, Division of Parasitic Diseases and Malaria, Parasitic Diseases Branch, USA,Oak Ridge Associated Universities, Oak Ridge, TN, USA
| | | | - Jennifer K. Ketzis
- Biomedical Sciences, One Health Center for Zoonoses & Tropical Veterinary Medicine, Ross University School of Veterinary Medicine, Saint Kitts and Nevis
| | - Arve Lee Willingham
- Department of Veterinary Medicine, College of Agriculture & Veterinary Medicine, United Arab Emirates
| | - Samson Mukaratirwa
- Biomedical Sciences, One Health Center for Zoonoses & Tropical Veterinary Medicine, Ross University School of Veterinary Medicine, Saint Kitts and Nevis
| | - Yvonne Qvarnstrom
- Centers for Disease Control and Prevention, Division of Parasitic Diseases and Malaria, Parasitic Diseases Branch, USA
| | - Joel L.N. Barratt
- Centers for Disease Control and Prevention, Division of Parasitic Diseases and Malaria, Parasitic Diseases Branch, USA,Corresponding author.
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18
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Zhang X, Jian Y, Ma Y, Li Z, Fu Y, Cairang Z, Wang X, Duo H, Guo Z. Prevalence of Intestinal Parasites in Dog Faecal Samples from Public Environments in Qinghai Province, China. Pathogens 2022; 11:1240. [PMID: 36364990 PMCID: PMC9696243 DOI: 10.3390/pathogens11111240] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 10/23/2022] [Accepted: 10/24/2022] [Indexed: 01/03/2024] Open
Abstract
Dogs are popular companions in our daily lives for company, hunting, protection or shepherding, but they also serve as reservoirs for zoonotic parasites. We analysed faecal samples from urban and rural environments in Qinghai Province on the Qinghai-Tibet Plateau of China to determine the prevalence of intestinal parasites. A total of 682 faecal samples were collected from four urban and two rural environments from October 2019 to December 2020. The samples were analysed for common intestinal parasites using a species-specific PCR approach. The total number of samples with parasites was 40 (5.87%): 23 (3.37%) were positive for helminths, and 17 (2.49%) were positive for protozoa. The following parasites were identified, and their respective prevalence rates were calculated: Cryptosporidium canis (1.32%), Giardia duodenalis (1.17%, assemblages D (n = 6) and C (n = 2)), Taenia hydatigena (1.03%), Taenia multiceps (0.59%), Toxocara canis (0.59%), Echinococcus shiquicus (0.29%), Dipylidium caninum (0.29%), Taenia pisiformis (0.15%), Mesocestoides lineatus (0.15%), Trichuris vulpis (0.15%), and Ancylostoma spp. (0.15%). The overall prevalence was significantly higher in dog faecal samples from rural environments than in those from urban environments (16.19% vs. 3.99%). E. shiquicus, T. pisiformis, M. lineatus, T. vulpis, and Ancylostoma spp. were only found in dog faecal samples from rural environments. The results of the present study indicate that intestinal parasite-positive dogs are important sources of environmental contamination, suggesting a significant zoonotic infection risk in humans and other animals. This has implications for the ongoing control of intestinal parasite infections in dogs in Qinghai Province, China.
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Affiliation(s)
- Xueyong Zhang
- Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, Xining 810016, China
- State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China
| | - Yingna Jian
- Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, Xining 810016, China
| | - Yijuan Ma
- Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, Xining 810016, China
| | - Zhi Li
- Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, Xining 810016, China
| | - Yong Fu
- Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, Xining 810016, China
| | - Zhouzai Cairang
- Gangcha County Animal Husbandry and Veterinary Station, Haibei 812399, China
| | - Xiaohong Wang
- Guinan County Animal Husbandry and Veterinary Station, Hainan 813100, China
| | - Hong Duo
- Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, Xining 810016, China
| | - Zhihong Guo
- Qinghai Academy of Animal Sciences and Veterinary Medicine, Qinghai University, Xining 810016, China
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19
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Raw C, Traub RJ, Zendejas-Heredia PA, Stevenson M, Wiethoelter A. A systematic review and meta-analysis of human and zoonotic dog soil-transmitted helminth infections in Australian Indigenous communities. PLoS Negl Trop Dis 2022; 16:e0010895. [PMID: 36279298 PMCID: PMC9632820 DOI: 10.1371/journal.pntd.0010895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 11/03/2022] [Accepted: 10/14/2022] [Indexed: 11/06/2022] Open
Abstract
Soil-transmitted helminths (STH) infect 1.5 billion people and countless animals worldwide. In Australian Indigenous communities, STH infections have largely remained endemic despite control efforts, suggesting reservoirs of infection may exist. Dogs fulfil various important cultural, social and occupational roles in Australian Indigenous communities and are populous in these settings. Dogs may also harbour zoonotic STHs capable of producing morbidity and mortality in dogs and humans. This review provides an overview of human and zoonotic STH infections, identifies the Australian Indigenous locations affected and the parasite species and hosts involved. The meta-analysis provides estimates of individual study and pooled true prevalence of STH infections in Australian Indigenous communities and identifies knowledge gaps for further research on zoonotic or anthroponotic potential. A systematic literature search identified 45 eligible studies documenting the presence of Strongyloides stercoralis, Trichuris trichiura, Ancylostoma caninum, Ancylostoma duodenale, Ancylostoma ceylanicum, undifferentiated hookworm, and Ascaris lumbricoides. Of these studies, 26 were also eligible for inclusion in meta-analysis to establish true prevalence in the light of imperfect diagnostic test sensitivity and specificity by Rogan-Gladen and Bayesian methods. These studies revealed pooled true prevalence estimates of 18.9% (95% CI 15.8–22.1) for human and canine S. stercoralis infections and 77.3% (95% CI 63.7–91.0) for canine A. caninum infections indicating continued endemicity, but considerably more heterogenous pooled estimates for canine A. ceylanicum infections, and A. duodenale, undifferentiated hookworm and T. trichiura in humans. This review suggests that the prevalence of STHs in Australian Indigenous communities has likely been underestimated, principally based on imperfect diagnostic tests. Potential misclassification of hookworm species in humans and dogs due to outdated methodology, also obscures this picture. High-quality contemporary studies are required to establish current true prevalence of parasite species in all relevant hosts to guide future policy development and control decisions under a culturally sound One Health framework. Soil-transmitted helminths include hookworms, threadworms, whipworms and roundworms. These worms may infect different hosts including humans and dogs, and some species are zoonotic, meaning that they are able to transmit between animals and humans. In many Australian Indigenous communities, people remain infected with these worms at high rates compared to other parts of the country despite various control strategies. Resource and health literacy inequalities are primary drivers for these differences. However, the potential for dogs to act as reservoirs for zoonotic worm infections in humans must also be considered. For this reason, it’s important to create a clear picture of the level of infection by location and host. Given that tests used to establish prevalence can produce false positive or negative results, we performed a meta-analysis allowing comparison of true prevalence estimates by location and host, regardless of the test used. This review suggests that threadworm and dog hookworm remain endemic in Australian Indigenous communities, though a gap exists to accurately inform the prevalence of the other worms. It also highlights the need for One Health strategies in research, policy and control where humans, all animal hosts and the environment are considered in a culturally relevant way.
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Affiliation(s)
- Cameron Raw
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
- * E-mail:
| | - Rebecca J. Traub
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Patsy A. Zendejas-Heredia
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Mark Stevenson
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
| | - Anke Wiethoelter
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, Victoria, Australia
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20
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Buonfrate D, Tamarozzi F, Paradies P, Watts MR, Bradbury RS, Bisoffi Z. The diagnosis of human and companion animal Strongyloides stercoralis infection: Challenges and solutions. A scoping review. ADVANCES IN PARASITOLOGY 2022; 118:1-84. [PMID: 36088083 DOI: 10.1016/bs.apar.2022.07.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Strongyloidiasis is the infection caused by soil-transmitted nematodes of Strongyloides species, infecting humans and some animals. Strongyloides stercoralis is the species with most clinical and epidemiological relevance in humans and dogs, due to its high prevalence and its capacity of inducing a life-threatening hyperinfection. Diagnosis of strongyloidiasis is challenging, due to the absence of a single reference standard test with high sensitivity and specificity, which also hampers the estimation of the accuracy of other diagnostic tests. In this chapter, we review the deployment and performance of the parasitological, immunological, molecular tests for the diagnosis of strongyloidiasis in humans and in dogs. Further, we comment the available evidence from genotyping studies that have addressed the zoonotic potential of S. stercoralis. Finally, we discuss the use of different diagnostic methods in relation to the purpose (i.e., screening, individual diagnosis, inclusion in a clinical trial) and the setting (endemic/non-endemic areas) and report the accuracy figures reported by systematic reviews on either parasitological, serological or molecular techniques published in literature.
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Affiliation(s)
- Dora Buonfrate
- Department of Infectious Tropical diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Verona, Italy.
| | - Francesca Tamarozzi
- Department of Infectious Tropical diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Verona, Italy
| | - Paola Paradies
- Department of Emergency and Organs Transplantation, Veterinary Section, Campus of Veterinary Medicine, University of Bari, Bari, Italy
| | - Matthew R Watts
- Centre for Infectious Diseases and Microbiology, Institute of Clinical Pathology and Medical Research - New South Wales Health Pathology and Sydney Institute for Infectious Diseases, Westmead Hospital, University of Sydney, Sydney, New South Wales, Australia
| | - Richard S Bradbury
- School of Health and Life Sciences, Federation University Australia, Berwick, VC, Australia
| | - Zeno Bisoffi
- Department of Infectious Tropical diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Verona, Italy; Department of Diagnostics and Public Health, University of Verona, Verona, Italy
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21
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Jacobson D, Zheng Y, Plucinski MM, Qvarnstrom Y, Barratt JLN. Evaluation of various distance computation methods for construction of haplotype-based phylogenies from large MLST dataset. Mol Phylogenet Evol 2022; 177:107608. [PMID: 35963590 PMCID: PMC10127246 DOI: 10.1016/j.ympev.2022.107608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 06/30/2022] [Accepted: 08/05/2022] [Indexed: 11/24/2022]
Abstract
Multi-locus sequence typing (MLST) is widely used to investigate genetic relationships among eukaryotic taxa, including parasitic pathogens. MLST analysis workflows typically involve construction of alignment-based phylogenetic trees - i.e., where tree structures are computed from nucleotide differences observed in a multiple sequence alignment (MSA). Notably, alignment-based phylogenetic methods require that all isolates/taxa are represented by a single sequence. When multiple loci are sequenced these sequences may be concatenated to produce one tree that includes information from all loci. Alignment-based phylogenetic techniques are robust and widely used yet possess some shortcomings, including how heterozygous sites are handled, intolerance for missing data (i.e., partial genotypes), and differences in the way insertions-deletions (indels) are scored/treated during tree construction. In certain contexts, 'haplotype-based' methods may represent a viable alternative to alignment-based techniques, as they do not possess the aforementioned limitations. This is namely because haplotype-based methods assess genetic similarity based on numbers of shared (i.e., intersecting) haplotypes as opposed to similarities in nucleotide composition observed in an MSA. For haplotype-based comparisons, choosing an appropriate distance statistic is fundamental, and several statistics are available to choose from. However, a comprehensive assessment of various available statistics for their ability to produce a robust haplotype-based phylogenetic reconstruction has not yet been performed. We evaluated seven distance statistics by applying them to extant MLST datasets from the gastrointestinal parasite Cyclospora cayetanensis and two species of pathogenic nematode of the genus Strongyloides. We compare the genetic relationships identified using each statistic to epidemiologic, geographic, and host metadata. We show that Barratt's heuristic definition of genetic distance was the most robust among the statistics evaluated. Consequently, it is proposed that Barratt's heuristic represents a useful approach for use in the context of challenging MLST datasets possessing features (i.e., high heterozygosity, partial genotypes, and indel or repeat-based polymorphisms) that confound or preclude the use of alignment-based methods.
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Affiliation(s)
- David Jacobson
- Parasitic Diseases Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, GA, USA; Oak Ridge Associated Universities, Oak Ridge, TN, USA
| | - Yueli Zheng
- Parasitic Diseases Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, GA, USA; Eagle Global Scientific, San Antonio, TX, USA
| | - Mateusz M Plucinski
- Malaria Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, GA, USA; U.S. President's Malaria Initiative, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Yvonne Qvarnstrom
- Parasitic Diseases Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Joel L N Barratt
- Parasitic Diseases Branch, Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, GA, USA.
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22
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Cháves-González LE, Morales-Calvo F, Mora J, Solano-Barquero A, Verocai GG, Rojas A. What lies behind the curtain: Cryptic diversity in helminth parasites of human and veterinary importance. CURRENT RESEARCH IN PARASITOLOGY & VECTOR-BORNE DISEASES 2022; 2:100094. [PMID: 35800064 PMCID: PMC9253710 DOI: 10.1016/j.crpvbd.2022.100094] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 05/28/2022] [Accepted: 06/07/2022] [Indexed: 11/17/2022]
Abstract
Parasite cryptic species are morphologically indistinguishable but genetically distinct organisms, leading to taxa with unclear species boundaries. Speciation mechanisms such as cospeciation, host colonization, taxon pulse, and oscillation may lead to the emergence of cryptic species, influencing host-parasite interactions, parasite ecology, distribution, and biodiversity. The study of cryptic species diversity in helminth parasites of human and veterinary importance has gained relevance, since their distribution may affect clinical and epidemiological features such as pathogenicity, virulence, drug resistance and susceptibility, mortality, and morbidity, ultimately affecting patient management, course, and outcome of treatment. At the same time, the need for recognition of cryptic species diversity has implied a transition from morphological to molecular diagnostic methods, which are becoming more available and accessible in parasitology. Here, we discuss the general approaches for cryptic species delineation and summarize some examples found in nematodes, trematodes and cestodes of medical and veterinary importance, along with the clinical implications of their taxonomic status. Lastly, we highlight the need for the correct interpretation of molecular information, and the correct use of definitions when reporting or describing new cryptic species in parasitology, since molecular and morphological data should be integrated whenever possible.
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Affiliation(s)
- Luis Enrique Cháves-González
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
| | - Fernando Morales-Calvo
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
| | - Javier Mora
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
| | - Alberto Solano-Barquero
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
| | - Guilherme G. Verocai
- Department of Veterinary Pathobiology, Texas A&M University, College of Veterinary Medicine and Biomedical Sciences, College Station, TX, USA
| | - Alicia Rojas
- Laboratory of Helminthology, Centro de Investigación en Enfermedades Tropicales, University of Costa Rica, San José, Costa Rica
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Global prevalence of Strongyloides stercoralis in dogs: A systematic review and meta-analysis. J Helminthol 2022; 96:e11. [DOI: 10.1017/s0022149x21000808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Abstract
Strongyloides stercoralis is an intestinal parasitic helminth that mainly affects humans and dogs throughout the world. Canine strongyloidosis is generally characterized by asymptomatic infection, with fatal disease in cases of immunodeficiency. This study was conducted in order to evaluate the global prevalence of S. stercoralis in dogs. Six electronic databases were searched for this purpose. The random effects model and 95% confidence intervals (CI) were applied to determine the overall and subgroup pooled prevalence. Heterogeneity was assessed by Cochran's Q test and I2 statistic. In total, 56 datasets from 50 studies from 1,202 peer-reviewed papers were included in the current meta-analysis. 20,627 dogs were assessed in 27 countries across six World Health Organization (WHO) regions. The global prevalence of S. stercoralis infection among dogs was 6% (95% CI 4–8%; 868/20,627). According to WHO regions, the estimated prevalence ranges 2% to 11% as follows: Western Pacific (11%, 0–31%); Africa (9%, 2–19%); America (6%, 3–11%); South-East Asia (5%, 1–13%)’ Europe (3%, 2–5%); and Eastern Mediterranean (2%, 0–6%). The pooled prevalence of S. stercoralis infection in dog owners was 7% (1–18%). The prevalence of S. stercoralis infection in studies based on serological assays was significantly higher than other techniques (29%, 20–39%). Younger female dogs, less than one year old, from rural areas had higher prevalence rates than their male counterparts, with no statistically significant differences. From this review, it is concluded that the low global prevalence of S. stercoralis in dogs may be strongly associated with low sensitivity diagnostic methods applied in most studies leading to the underestimation of infection rates. Therefore, the improvement of diagnostic techniques is recommended for precise evaluation of the disease.
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Bradbury RS, Pafčo B, Nosková E, Hasegawa H. Strongyloides genotyping: a review of methods and application in public health and population genetics. Int J Parasitol 2021; 51:1153-1166. [PMID: 34757088 DOI: 10.1016/j.ijpara.2021.10.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 10/07/2021] [Accepted: 10/11/2021] [Indexed: 12/12/2022]
Abstract
Strongyloidiasis represents a major medical and veterinary helminthic disease. Human infection is caused by Strongyloides stercoralis, Strongyloides fuelleborni fuelleborni and Strongyloides fuelleborni kellyi, with S.stercoralis accounting for the majority of cases. Strongyloides f. fuelleborni likely represents a zoonosis acquired from non-human primates (NHPs), while no animal reservoir for S. f. kellyi infection has been found. Whether S. stercoralis represents a zoonosis acquired from dogs and cats remains unanswered. Over the past two decades various tools have been applied to genotype Strongyloides spp. The most commonly sequenced markers have been the hyper-variable regions I and IV of the 18S rRNA gene and selected portions of the cytochrome c oxidase subunit I gene. These markers have been sequenced and compared in Strongyloides from multiple hosts and geographical regions. More recently, a machine learning algorithm multi-locus sequence typing approach has been applied using these markers, while others have applied whole genome sequencing. Genotyping of Strongyloides from dogs, cats, NHPs and humans has identified that S. stercoralis likely originated in dogs and adapted to human hosts. It has also been demonstrated that S. stercoralis is distinct from S. f. fuelleborni and S. f. kellyi. Two distinct genetic clades of S. stercoralis exist, one restricted to dogs and another infecting humans, NHPs, dogs and cats. Genotyping of S. f. fuelleborni has identified two separate clades, one associated with African isolates and another Indochinese peninsular clade. This review summarises the history and development of genotyping tools for Strongyloides spp. It describes the findings of major studies to date in the context of the epidemiology and evolutionary biology of these helminths, with a specific focus on human-infecting species.
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Affiliation(s)
- Richard S Bradbury
- Health Innovation and Transformation Centre, Federation University, Berwick, Victoria, Australia.
| | - Barbora Pafčo
- Institute of Vertebrate Biology, The Czech Academy of Sciences, Brno, Czech Republic
| | - Eva Nosková
- Department of Botany and Zoology, Faculty of Science, Masaryk University, Brno, Czech Republic
| | - Hideo Hasegawa
- Department of Biomedicine, Faculty of Medicine, Oita University, Yufu, Oita, Japan
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Molecular detection of Strongyloides sp. in Australian Thoroughbred foals. Parasit Vectors 2021; 14:444. [PMID: 34479608 PMCID: PMC8414860 DOI: 10.1186/s13071-021-04966-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 08/18/2021] [Indexed: 11/11/2022] Open
Abstract
Background Strongyloides westeri is found in the small intestine of young horses, mainly in foals up to about 16 weeks of age. The main source of infection for foals is through transmammary transmission, and foals can develop acute diarrhoea, weakness, dermatitis and respiratory signs. The epidemiology of S. westeri in Australia is largely unknown. Further, molecular techniques have never been employed for detection of S. westeri in horses. This pilot study aimed to assess the utility of a molecular phylogenetic method for the detection of S. westeri in the faeces of foals. Methods Faecal samples were collected from a foal of less than 2 months of age, and eggs of Strongyloides sp. were detected using the modified McMaster technique. DNA was extracted from purified eggs, and a partial fragment of the small subunit of the nuclear ribosomal DNA (18S) was characterised using polymerase chain reaction, DNA sequencing and phylogenetic methods. Results Microscopic examination of faeces revealed small ellipsoidal eggs typical of Strongyloides sp. The 18S sequence generated by PCR in this study revealed 98.4% identity with that of a reference sequence of S. westeri available from GenBank. Phylogenetic analyses revealed a polyphyletic clustering of S. westeri sequences. Conclusion This is the first study reporting the detection of DNA of Strongyloides sp. in faeces of a foal using a molecular phylogenetic approach targeting the variable region of 18S rDNA. It is anticipated that this study will allow future molecular epidemiological studies on S. westeri in horses. Graphical abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-04966-1.
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Hillier SA, Taleb A, Chaccour E, Aenishaenslin C. Examining the concept of One Health for indigenous communities: A systematic review. One Health 2021; 12:100248. [PMID: 33912647 PMCID: PMC8066803 DOI: 10.1016/j.onehlt.2021.100248] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2020] [Revised: 04/08/2021] [Accepted: 04/08/2021] [Indexed: 11/25/2022] Open
Abstract
Purpose This paper examines whether the usage of the concept of One Health in Canada-based research aligns with traditional Indigenous notions of health and wellness. Methods A comprehensive search of the literature was conducted using primary databases, including Scholars Portal, ProQuest Social Science, Sociological Abstracts (ProQuest), OVID Healthstar, Embase, Medline, Pubmed and Google Scholar. Papers discussing One Health and Indigenous Health were selected and analyzed through Nvivo12 to generate common themes across the studies. Results The analysis identified three major themes that focused on One Health as it relates to climate change, zoonosis, and social relationships between humans and animals. Climate change was seen to have affected the environmental health of Northern latitude areas where many Indigenous communities reside. Infectious diseases within Indigenous communities were a frequent topic of study and indicated that infections transmitted by dogs are likely to be addressed with One Health interventions. One Health interventions are likely to equally address the health of humans, animals, and the environment. Conclusions No significant connection between One Health and Indigenous knowledges was established in the analyzed articles. Articles discussed One Health as it pertains to epidemiological surveillance and research. The implications of utilizing One Health towards Indigenous Peoples and culture were not explicitly addressed.
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Affiliation(s)
- Sean A Hillier
- School of Health Policy & Management, Faculty of Health, York University, 348A Stong College, 4700 Keele St., Toronto, Ont M3J 1P3, Canada
| | - Abdul Taleb
- Dalla Lana School of Public Health, University of Toronto, Canada
| | - Elias Chaccour
- Health Policy & Equity, School of Health Policy & Management, Faculty of Health, York University, Canada
| | - Cécile Aenishaenslin
- Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, Canada
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Shield J, Braat S, Watts M, Robertson G, Beaman M, McLeod J, Baird RW, Hart J, Robson J, Lee R, McKessar S, Nicholson S, Mayer-Coverdale J, Biggs BA. Seropositivity and geographical distribution of Strongyloides stercoralis in Australia: A study of pathology laboratory data from 2012-2016. PLoS Negl Trop Dis 2021; 15:e0009160. [PMID: 33690623 PMCID: PMC7978363 DOI: 10.1371/journal.pntd.0009160] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 03/19/2021] [Accepted: 01/20/2021] [Indexed: 11/18/2022] Open
Abstract
Background There are no national prevalence studies of Strongyloides stercoralis infection in Australia, although it is known to be endemic in northern Australia and is reported in high risk groups such as immigrants and returned travellers. We aimed to determine the seropositivity (number positive per 100,000 of population and percent positive of those tested) and geographical distribution of S. stercoralis by using data from pathology laboratories. Methodology We contacted all seven Australian laboratories that undertake Strongyloides serological (ELISA antibody) testing to request de-identified data from 2012–2016 inclusive. Six responded. One provided positive data only. The number of people positive, number negative and number tested per 100,000 of population (Australian Bureau of Statistics data) were calculated including for each state/territory, each Australian Bureau of Statistics Statistical Area Level 3 (region), and each suburb/town/community/locality. The data was summarized and expressed as maps of Australia and Greater Capital Cities. Principal findings We obtained data for 81,777 people who underwent serological testing for Strongyloides infection, 631 of whom were from a laboratory that provided positive data only. Overall, 32 (95% CI: 31, 33) people per 100,000 of population were seropositive, ranging between 23/100,000 (95% CI: 19, 29) (Tasmania) and 489/100,000 population (95%CI: 462, 517) (Northern Territory). Positive cases were detected across all states and territories, with the highest (260-996/100,000 and 17–40% of those tested) in regions across northern Australia, north-east New South Wales and north-west South Australia. Some regions in Greater Capital Cities also had a high seropositivity (112-188/100,000 and 17–20% of those tested). Relatively more males than females tested positive. Relatively more adults than children tested positive. Children were under-represented in the data. Conclusions/Significance The study confirms that substantial numbers of S. stercoralis infections occur in Australia and provides data to inform public health planning. Strongyloides stercoralis, a parasitic roundworm, is endemic in many countries world-wide. In Australia, groups at risk for strongyloidiasis include Aboriginal and/or Torres Strait Islander people, who acquired this parasite locally, and immigrants and returned travellers who acquired the infection outside Australia. We obtained deidentified results of ELISA IgG antibody tests for Strongyloides from diagnostic pathology laboratories during 2012 to 2016 and calculated the number of people who were positive at least once and the number who never had a positive result. We drew maps showing the number positive per 100,000 of population, the percent positive of those tested, and the number tested/100,000 for each region and the number positive in each suburb of residence according to the Australian Bureau of Statistics. The highest seropositivity (260-996/100,000 of population) was in Northern Australia, north-west South Australia and north-east New South Wales where many Aboriginal and Torres Strait Islander people live in remote communities. There were also some regions in Greater Capital Cities with a high number of people positive per 100,000 of population (112-188/100,000), likely reflecting higher populations of immigrants and returned travellers who were infected outside Australia.
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Affiliation(s)
- Jennifer Shield
- Departments of Medicine and Infectious Diseases at the Doherty Institute, University of Melbourne, Melbourne, Victoria, Australia
- Department of Pharmacy and Applied Science, La Trobe University, Bendigo, Victoria, Australia
- * E-mail:
| | - Sabine Braat
- Departments of Medicine and Infectious Diseases at the Doherty Institute, University of Melbourne, Melbourne, Victoria, Australia
- Melbourne School of Population and Global Health, University of Melbourne, Parkville, Victoria, Australia
| | - Matthew Watts
- Centre for Infectious Diseases and Microbiology, Pathology West-ICPMR and Marie Bashir Institute, University of Sydney, Westmead Hospital, Westmead, New South Wales, Australia
| | | | - Miles Beaman
- PathWest Laboratory Medicine, Nedlands, Western Australia, Australia
| | - James McLeod
- Territory Pathology, Alice Springs Hospital, Alice Springs, Northern Territory, Australia
| | - Robert W. Baird
- Territory Pathology, Royal Darwin Hospital, Tiwi, Northern Territory, Australia
| | - Julie Hart
- PathWest Laboratory Medicine, Nedlands, Western Australia, Australia
| | - Jennifer Robson
- Sullivan Nicolaides Pathology, Bowen Hills, Queensland, Australia
| | - Rogan Lee
- Centre for Infectious Diseases and Microbiology, Pathology West-ICPMR and Marie Bashir Institute, University of Sydney, Westmead Hospital, Westmead, New South Wales, Australia
| | | | - Suellen Nicholson
- Victorian Infectious Diseases Reference Laboratory, Doherty Institute, Melbourne, Victoria, Australia
| | | | - Beverley-Ann Biggs
- Departments of Medicine and Infectious Diseases at the Doherty Institute, University of Melbourne, Melbourne, Victoria, Australia
- Victorian Infectious Disease Service, Royal Melbourne Hospital, Melbourne, Victoria, Australia
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Gordon CA, Shield JM, Bradbury RS, Muhi S, Page W, Judd JA, Lee R, Biggs BA, Ross K, Kurscheid J, Gray DJ, McManus DP. HTLV-I and Strongyloides in Australia: The worm lurking beneath. ADVANCES IN PARASITOLOGY 2021; 111:119-201. [PMID: 33482974 DOI: 10.1016/bs.apar.2020.11.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Strongyloidiasis and HTLV-I (human T-lymphotropic virus-1) are important infections that are endemic in many countries around the world with an estimated 370 million infected with Strongyloides stercoralis alone, and 5-10 million with HTVL-I. Co-infections with these pathogens are associated with significant morbidity and can be fatal. HTLV-I infects T-cells thus causing dysregulation of the immune system which has been linked to dissemination and hyperinfection of S. stercoralis leading to bacterial sepsis which can result in death. Both of these pathogens are endemic in Australia primarily in remote communities in Queensland, the Northern Territory, and Western Australia. Other cases in Australia have occurred in immigrants and refugees, returned travellers, and Australian Defence Force personnel. HTLV-I infection is lifelong with no known cure. Strongyloidiasis is a long-term chronic disease that can remain latent for decades, as shown by infections diagnosed in prisoners of war from World War II and the Vietnam War testing positive decades after they returned from these conflicts. This review aims to shed light on concomitant infections of HTLV-I with S. stercoralis primarily in Australia but in the global context as well.
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Affiliation(s)
- Catherine A Gordon
- Infectious Diseases Program, QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia.
| | - Jennifer M Shield
- Department of Pharmacy and Biomedical Sciences, La Trobe University, Bendigo, VIC, Australia; Department of Medicine, The Peter Doherty Institute for Infection and Immunity, University of Melbourne and the Royal Melbourne Hospital, Melbourne, VIC, Australia
| | - Richard S Bradbury
- School of Health and Life Sciences, Federation University, Berwick, VIC, Australia
| | - Stephen Muhi
- Victorian Infectious Diseases Service, The Royal Melbourne Hospital, Parkville, VIC, Australia
| | - Wendy Page
- College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, QLD, Australia
| | - Jenni A Judd
- School of Health Medical and Applied Sciences, Central Queensland University, Bundaberg, QLD, Australia; Centre for Indigenous Health Equity Research, Central Queensland University, Bundaberg, QLD, Australia
| | - Rogan Lee
- Westmead Clinical School, The University of Sydney, Westmead, NSW, Australia
| | - Beverley-Ann Biggs
- Department of Medicine, The Peter Doherty Institute for Infection and Immunity, University of Melbourne and the Royal Melbourne Hospital, Melbourne, VIC, Australia; Victorian Infectious Diseases Service, The Royal Melbourne Hospital, Parkville, VIC, Australia
| | - Kirstin Ross
- College of Science and Engineering, Flinders University, Adelaide, South Australia, Australia
| | - Johanna Kurscheid
- Department of Global Health, Research School of Population Health, Australian National University, Acton, ACT, Australia
| | - Darren J Gray
- Department of Global Health, Research School of Population Health, Australian National University, Acton, ACT, Australia
| | - Donald P McManus
- Infectious Diseases Program, QIMR Berghofer Medical Research Institute, Brisbane, QLD, Australia
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DISTRIBUTION OF STRONGYLOIDES STERCORALIS AMONG DOGS OF DIFFERENT HOUSING GROUPS IN KYIV AND KYIV REGION, CLINICAL MANIFESTATIONS AND DIAGNOSTIC METHODS. EUREKA: HEALTH SCIENCES 2020. [DOI: 10.21303/2504-5679.2020.001423] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Strongyloidiasis in dogs, despite its uncertain zoonotic status, is potentially danger for dogs owners. It is considered that strongyloidiases characteristic for tropical and subtropical regions, but in recent years it is increasingly found in non-endemic countries.
The aim. To determine the extent of the invasion, clinical signs and diagnostic methods of strongyloidiasis in dogs of different groups in Kyiv and Kyiv region.
Materials and methods. A total of 364 dogs were studied (130 animals lived in shelters (Group 1) and 234 in homes (Group 2). Diagnosis of strongyloidiasis was performed by native smear and Baerman methods. Additionally, the sensitivity of the modified string test was tested. Samples of venous blood were taken from dogs with confirmed strongyloidiasis for haematological and biochemical analysis.
Results. A study found that the extent of invasion (EI) in shelters and home dogs was 3.0±0.36 % (4/130; Group 1) and 2.5±0.25 % % (6/234; Group 2) respectively.
It was found that three repetitions of the Baerman method test increased its efficiency to 90.5 %. The sensitivity of the modified string test was 100 %.
Clinical manifestations included disorders of the respiratory (20 %: 2/10) and digestive systems (80 %: 8/10), weight loss (70 %: 7/10). Blood tests did not reveal changes specific to strongyloidiasis, eosinophilia was observed in only one dog in the acute stage of the disease.
Conclusions. The results of our studies indicate the presence of strongyloidiasis in dogs in Kyiv and Kyiv region and probability of the spread of the pathogen in the environment. Symptoms in dogs with strongyloidiasis were nonspecific and cannot be used for diagnosis. A modified string test and Baerman method has demonstrated high efficacy and may be recommended to clarify the diagnosis of a chronic invasion.
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Barratt JLN, Sapp SGH. Machine learning-based analyses support the existence of species complexes for Strongyloides fuelleborni and Strongyloides stercoralis. Parasitology 2020; 147:1184-1195. [PMID: 32539880 PMCID: PMC7443747 DOI: 10.1017/s0031182020000979] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Human strongyloidiasis is a serious disease mostly attributable to Strongyloides stercoralis and to a lesser extent Strongyloides fuelleborni, a parasite mainly of non-human primates. The role of animals as reservoirs of human-infecting Strongyloides is ill-defined, and whether dogs are a source of human infection is debated. Published multi-locus sequence typing (MLST) studies attempt to elucidate relationships between Strongyloides genotypes, hosts, and distributions, but typically examine relatively few worms, making it difficult to identify population-level trends. Combining MLST data from multiple studies is often impractical because they examine different combinations of loci, eliminating phylogeny as a means of examining these data collectively unless hundreds of specimens are excluded. A recently-described machine learning approach that facilitates clustering of MLST data may offer a solution, even for datasets that include specimens sequenced at different combinations of loci. By clustering various MLST datasets as one using this procedure, we sought to uncover associations among genotype, geography, and hosts that remained elusive when examining datasets individually. Multiple datasets comprising hundreds of S. stercoralis and S. fuelleborni individuals were combined and clustered. Our results suggest that the commonly proposed 'two lineage' population structure of S. stercoralis (where lineage A infects humans and dogs, lineage B only dogs) is an over-simplification. Instead, S. stercoralis seemingly represents a species complex, including two distinct populations over-represented in dogs, and other populations vastly more common in humans. A distinction between African and Asian S. fuelleborni is also supported here, emphasizing the need for further resolving these taxonomic relationships through modern investigations.
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Affiliation(s)
- Joel L N Barratt
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Parasitic Diseases Branch, Atlanta, USA
- Oak Ridge Associated Universities, Oak Ridge, Tennessee, USA
| | - Sarah G H Sapp
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Parasitic Diseases Branch, Atlanta, USA
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Ko PP, Suzuki K, Canales-Ramos M, Aung MPPTHH, Htike WW, Yoshida A, Montes M, Morishita K, Gotuzzo E, Maruyama H, Nagayasu E. Phylogenetic relationships of Strongyloides species in carnivore hosts. Parasitol Int 2020; 78:102151. [PMID: 32502520 DOI: 10.1016/j.parint.2020.102151] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/27/2020] [Accepted: 05/27/2020] [Indexed: 12/20/2022]
Abstract
Strongyloides stercoralis is a parasitic nematode and a major pathogen responsible for human strongyloidiasis. The presence of this species in the dog population has led to an interest in studying the phylogenetic relationships among Strongyloides spp. in carnivore hosts. In the present study, Strongyloides spp. from various carnivore hosts (raccoon, Japanese badger, Siberian weasel, raccoon dog, masked palm civet, and domestic cat) were sought. Except for civets, Strongyloides spp. were identified in all host species. Based on 18S rDNA sequences, nine OTUs (operational taxonomy units) were identified. Molecular phylogenetic analyses using 18S28S rDNA and mitochondrial cox1 (cytochrome c oxidase subunit 1) sequences clustered them into two groups. The first group (named the stercoralis/procyonis group) was comprised of six OTUs and occurred in cats, raccoon dogs, raccoons (S. procyonis), Siberian weasels, and Japanese badgers and included S. stercoralis from humans and dogs. The second group (named the planiceps group) was made up of Strongyloides spp. from raccoon dogs (two OTUs) and one OTU from Siberian weasels. Subsequent analysis using almost the full-length nucleotide sequences of protein-coding genes in their mitochondrial genomes placed Strongyloides spp. of cats in a sister taxon position to S. stercoralis, whereas S. procyonis from raccoons was more distantly related to them. The presence of Strongyloides spp. from various carnivore hosts, which are close relatives of S. stercoralis, suggests this group of Strongyloides (the stercoralis/procyonis group) essentially evolved as parasites of carnivores, although more data on Strongyloides spp. from primate hosts are needed.
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Affiliation(s)
- Phoo Pwint Ko
- Division of Parasitology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan; Department of Microbiology, University of Medicine 1, No. 245, Myoma Kyaung Street, Lanmadaw Township, Yangon, Myanmar.
| | - Kazuo Suzuki
- Hikiiwa Park Center, 1629 Inari-cho, Tanabe, Wakayama 646-0051, Japan.
| | - Marco Canales-Ramos
- Instituto de Medicina Tropical 'Alexander von Humboldt', Facultad de Medicina, Universidad Peruana Cayetano Heredia, Honorio Delgado 430, San Martin de Porres, Lima 15102, Peru.
| | | | - Wah Win Htike
- Department of Microbiology, University of Medicine 1, No. 245, Myoma Kyaung Street, Lanmadaw Township, Yangon, Myanmar
| | - Ayako Yoshida
- Laboratory of Veterinary Parasitic Diseases, Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen-kibanadai-nishi, 889-2192 Miyazaki, Japan; Center for Animal Disease Control, University of Miyazaki, 1-1 Gakuen-kibanadai-nishi, 889-2192 Miyazaki, Japan.
| | - Martin Montes
- Instituto de Medicina Tropical 'Alexander von Humboldt', Facultad de Medicina, Universidad Peruana Cayetano Heredia, Honorio Delgado 430, San Martin de Porres, Lima 15102, Peru.
| | - Kazuhiro Morishita
- Division of Tumor and Cellular Biochemistry, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan.
| | - Eduardo Gotuzzo
- Instituto de Medicina Tropical 'Alexander von Humboldt', Facultad de Medicina, Universidad Peruana Cayetano Heredia, Honorio Delgado 430, San Martin de Porres, Lima 15102, Peru.
| | - Haruhiko Maruyama
- Division of Parasitology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan; Center for Animal Disease Control, University of Miyazaki, 1-1 Gakuen-kibanadai-nishi, 889-2192 Miyazaki, Japan.
| | - Eiji Nagayasu
- Division of Parasitology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan.
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Beknazarova M, Whiley H, Traub R, Ross K. Opportunistic Mapping of Strongyloides stercoralis and Hookworm in Dogs in Remote Australian Communities. Pathogens 2020; 9:E398. [PMID: 32455702 PMCID: PMC7281600 DOI: 10.3390/pathogens9050398] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/12/2020] [Accepted: 05/19/2020] [Indexed: 12/17/2022] Open
Abstract
Both Strongyloides stercoralis and hookworms are common soil-transmitted helminths in remote Australian communities. In addition to infecting humans, S. stercoralis and some species of hookworms infect canids and therefore present both environmental and zoonotic sources of transmission to humans. Currently, there is limited information available on the prevalence of hookworms and S. stercoralis infections in dogs living in communities across the Northern Territory in Australia. In this study, 274 dog faecal samples and 11 faecal samples of unknown origin were collected from the environment and directly from animals across 27 remote communities in Northern and Central Australia. Samples were examined using real-time polymerase chain reaction (PCR) analysis for the presence of S. stercoralis and four hookworm species: Ancylostoma caninum, Ancylostoma ceylanicum, Ancylostoma braziliense and Uncinaria stenocephala. The prevalence of S. stercoralis in dogs was found to be 21.9% (60/274). A. caninum was the only hookworm detected in the dog samples, with a prevalence of 31.4% (86/274). This study provides an insight into the prevalence of S. stercoralis and hookworms in dogs and informs future intervention and prevention strategies aimed at controlling these parasites in both dogs and humans. A "One Health" approach is crucial for the prevention of these diseases in Australia.
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Affiliation(s)
- Meruyert Beknazarova
- Faculty of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia; (H.W.); (K.R.)
| | - Harriet Whiley
- Faculty of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia; (H.W.); (K.R.)
| | - Rebecca Traub
- Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Parkville, VIC 3052, Australia;
| | - Kirstin Ross
- Faculty of Science and Engineering, Flinders University, Bedford Park, SA 5042, Australia; (H.W.); (K.R.)
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Aupalee K, Wijit A, Singphai K, Rödelsperger C, Zhou S, Saeung A, Streit A. Genomic studies on Strongyloides stercoralis in northern and western Thailand. Parasit Vectors 2020; 13:250. [PMID: 32404172 PMCID: PMC7222524 DOI: 10.1186/s13071-020-04115-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 04/29/2020] [Indexed: 01/13/2023] Open
Abstract
Background Strongyloidiasis is a soil borne helminthiasis, which in most cases is caused by Strongyloides stercoralis. Human infections with S. fuelleborni fuelleborni and S. fuelleborni kellyi also occur. Although up to 370 million people are currently estimated to be infected with S. stercoralis, this parasite is frequently overlooked. Strongyloides stercoralis is prevalent among humans in Thailand; however, S. fuelleborni fuelleborni has also been reported. Three recent genomic studies of individual S. stercoralis worms found genetically diverse populations of S. stercoralis, with comparably low heterozygosity in Cambodia and Myanmar, and less diverse populations with high heterozygosity in Japan and southern China that presumably reproduce asexually. Methods We isolated individual Strongyloides spp. from different localities in northern and western Thailand and determined their nuclear small ribosomal subunit rDNA (18S rDNA, SSU), in particular the hypervariable regions I and IV (HVR-I and HVR-IV), mitochondrial cytochrome c oxidase subunit 1 (cox1) and for a subset whole genome sequences. These sequences were then compared with each other and with published sequences from different geographical locations. Results All 237 worms isolated from 16 different human hosts were S. stercoralis, no S. fuelleborni was found. All worms had the common S. stercoralis SSU HVR IV haplotype A. Two different SSU HVR I haplotypes (I and II), both previously described in S. stercoralis, were found. No animal heterozygous for the two haplotypes was identified. Among the twelve cox1 haplotypes found, five had not been previously described. Based upon the mitochondrial cox1 and the nuclear whole genome sequences, S. stercoralis in Thailand was phylogenetically intermixed with the samples from other Southeast Asian countries and did not form its own branch. The genomic heterozygosity was even slightly lower than in the samples from the neighboring countries. Conclusions In our sample from humans, all Strongyloides spp. were S. stercoralis. The S. stercoralis from northern and western Thailand appear to be part of a diverse, intermixing continental Southeast Asian population. No obvious indication for genetic sub-structuring of S. stercoralis within Thailand or within the Southeast Asian peninsula was detected.![]()
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Affiliation(s)
- Kittipat Aupalee
- Graduate Doctoral Degree Program in Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Adulsak Wijit
- Office of Disease Prevention and Control, 1st Department of Disease Control, Ministry of Public Health, Chiang Mai, Thailand
| | - Kittikhun Singphai
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
| | - Christian Rödelsperger
- Department of Integrative Evolutionary Biology, Max Planck Institute for Developmental Biology, Tübingen, Baden-Württemberg, Germany
| | - Siyu Zhou
- Department of Integrative Evolutionary Biology, Max Planck Institute for Developmental Biology, Tübingen, Baden-Württemberg, Germany. .,School of Preclinical Medicine, Guangxi Medical University, Nanning, Guangxi, China.
| | - Atiporn Saeung
- Department of Parasitology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.
| | - Adrian Streit
- Department of Integrative Evolutionary Biology, Max Planck Institute for Developmental Biology, Tübingen, Baden-Württemberg, Germany.
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Dogs are reservoir hosts for possible transmission of human strongyloidiasis in Thailand: molecular identification and genetic diversity of causative parasite species. J Helminthol 2019; 94:e110. [DOI: 10.1017/s0022149x1900107x] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Abstract
Human strongyloidiasis is a deleterious gastrointestinal disease mainly caused by Strongyloides stercoralis infection. We aimed to study the possible transmission of S. stercoralis between humans and pet animals. We isolated Strongyloides from humans and domestic dogs in the same rural community in north-east Thailand and compared the nucleotide sequences of derived worms using portions of the mitochondrial cytochrome c oxidase subunit 1 (cox1) and 18S ribosomal RNA (18S rRNA) genes. Twenty-eight sequences from the 18S rRNA gene were obtained from worms derived from humans (n = 23) and dogs (n = 5), and were identical with S. stercoralis sequences (from Thailand, Cambodia, Lao PDR and Myanmar) published in the GenBank database. The 28 cox1 sequences from humans and dogs showed high similarity to each other. The available published cox1 sequences (n = 150), in combination with our 28 sequences, represented 68 haplotypes distributed among four clusters. The 28 samples from the present study represented eight haplotypes including four new haplotypes. Dogs and humans shared the same haplotypes, suggesting the possibility of zoonotic transmission from pet dogs to humans. This is of concern since dogs and humans live in close association with each other.
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Zhou S, Harbecke D, Streit A. From the feces to the genome: a guideline for the isolation and preservation of Strongyloides stercoralis in the field for genetic and genomic analysis of individual worms. Parasit Vectors 2019; 12:496. [PMID: 31640777 PMCID: PMC6805601 DOI: 10.1186/s13071-019-3748-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 10/11/2019] [Indexed: 01/22/2023] Open
Abstract
Strongyloidiasis is a soil-borne helminthiasis, which, in spite of the up to 370 million people currently estimated to be infected with its causing agent, the nematode Strongyloides stercoralis, is frequently overlooked. Recent molecular taxonomic studies conducted in Southeast Asia and Australia, showed that dogs can carry the same genotypes of S. stercoralis that also infect humans, in addition to a presumably dog-specific Strongyloides species. This suggests a potential for zoonotic transmission of S. stercoralis from dogs to humans. Although natural S. stercoralis infections have not been reported in any host other than humans, non-human primates and dogs, other as yet unidentified animal reservoirs cannot be excluded. Molecular studies also showed that humans carry rather different genotypes of S. stercoralis. As a result, their taxonomic status and the question of whether they differ in their pathogenic potential remains open. It would therefore be very important to obtain molecular genetic/genomic information about S. stercoralis populations from around the world. One way of achieving this (with little additional sampling effort) would be that people encountering S. stercoralis in the process of their diagnostic work preserve some specimens for molecular analysis. Here we provide a guideline for the isolation, preservation, genotyping at the nuclear 18S rDNA and the mitochondrial cox1 loci, and for whole genome sequencing of single S. stercoralis worms. Since in many cases the full analysis is not possible or desired at the place and time where S. stercoralis are found, we emphasize when and how samples can be preserved, stored and shipped for later analysis. We hope this will benefit and encourage researchers conducting field studies or diagnostics to collect and preserve S. stercoralis for molecular genetic/genomic analyses and either analyze them themselves or make them available to others for further analysis.![]()
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Affiliation(s)
- Siyu Zhou
- School of Preclinical Medicine, Guangxi Medical University, Nanning, Guangxi, China
| | - Dorothee Harbecke
- Department of Integrative Evolutionary Biology, Max Planck Institute for Developmental Biology, Tübingen, Baden-Württemberg, Germany
| | - Adrian Streit
- Department of Integrative Evolutionary Biology, Max Planck Institute for Developmental Biology, Tübingen, Baden-Württemberg, Germany.
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Barratt JLN, Lane M, Talundzic E, Richins T, Robertson G, Formenti F, Pritt B, Verocai G, Nascimento de Souza J, Mato Soares N, Traub R, Buonfrate D, Bradbury RS. A global genotyping survey of Strongyloides stercoralis and Strongyloides fuelleborni using deep amplicon sequencing. PLoS Negl Trop Dis 2019; 13:e0007609. [PMID: 31525192 PMCID: PMC6762204 DOI: 10.1371/journal.pntd.0007609] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 09/26/2019] [Accepted: 07/06/2019] [Indexed: 01/21/2023] Open
Abstract
Strongyloidiasis is a neglected tropical disease caused by the human infective nematodes Strongyloides stercoralis, Strongyloides fuelleborni fuelleborni and Strongyloides fuelleborni kellyi. Previous large-scale studies exploring the genetic diversity of this important genus have focused on Southeast Asia, with a small number of isolates from the USA, Switzerland, Australia and several African countries having been genotyped. Consequently, little is known about the global distribution of geographic sub-variants of these nematodes and the genetic diversity that exists within the genus Strongyloides generally. We extracted DNA from human, dog and primate feces containing Strongyloides, collected from several countries representing all inhabited continents. Using a genotyping assay adapted for deep amplicon sequencing on the Illumina MiSeq platform, we sequenced the hyper-variable I and hyper-variable IV regions of the Strongyloides 18S rRNA gene and a fragment of the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene from these specimens. We report several novel findings including unique S. stercoralis and S. fuelleborni genotypes, and the first identifications of a previously unknown S. fuelleborni infecting humans within Australia. We expand on an existing Strongyloides genotyping scheme to accommodate S. fuelleborni and these novel genotypes. In doing so, we compare our data to all 18S and cox1 sequences of S. fuelleborni and S. stercoralis available in GenBank (to our knowledge), that overlap with the sequences generated using our approach. As this analysis represents more than 1,000 sequences collected from diverse hosts and locations, representing all inhabited continents, it allows a truly global understanding of the population genetic structure of the Strongyloides species infecting humans, non-human primates, and domestic dogs. Strongyloidiasis is a neglected tropical disease caused by the human infective worms (nematodes) Strongyloides stercoralis, Strongyloides fuelleborni fuelleborni and Strongyloides fuelleborni kellyi. Little is known about the genetic diversity of these nematodes and the possibility of geographically isolated genetic types is a particularly interesting research question, given the unique life cycle of these worms which includes both sexual and asexual stages. We extracted DNA from human, dog and primate feces containing Strongyloides, collected from several countries representing all inhabited continents. Using next-generation sequencing, we analyzed three Strongyloides DNA fragments from these specimens; two fragments of the 18S gene and one from the cytochrome c oxidase subunit 1 (cox1) gene. Using this approach, we discovered some unique S. stercoralis and S. fuelleborni genotypes, and identified a previously unknown S. fuelleborni infecting humans within Australia. We compared our data to all 18S and cox1 sequences of S. fuelleborni and S. stercoralis available in public databases and identified several patterns relating to the global distribution of certain genotypes. This knowledge could allow us to infer the origin of human Strongyloides infections in the future, and assess the role certain animals (non-human primates and dogs) might play in the transmission of Strongyloides to humans.
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Affiliation(s)
- Joel L. N. Barratt
- Division of Parasitic Diseases and Malaria, Parasitic Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
- Oak Ridge Associated Universities, Oak Ridge, Tennessee, United States of America
| | - Meredith Lane
- Division of Parasitic Diseases and Malaria, Parasitic Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
- Synergy America Inc., Atlanta, Georgia, United States of America
| | - Emir Talundzic
- Franklin College of Arts and Sciences, University of Georgia, Athens, Georgia, United States of America
| | - Travis Richins
- Rollins School of Public Health, Emory University, Atlanta, Georgia, United States of America
| | - Gemma Robertson
- Forensic and Scientific Services, Health Support Queensland, Brisbane, Queensland, Australia
| | - Fabio Formenti
- Department of Infectious–Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy
| | - Bobbi Pritt
- Mayo Clinic, Rochester, Minnesota, United States of America
| | - Guilherme Verocai
- College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, Texas, United States of America
| | | | - Neci Mato Soares
- Faculdade de Farmacia, Universidade Federal da Bahia, Bahia, Brazil
| | - Rebecca Traub
- Faculty of Veterinary Science, University of Melbourne, Victoria, Australia
| | - Dora Buonfrate
- Department of Infectious–Tropical Diseases and Microbiology, IRCCS Sacro Cuore Don Calabria Hospital, Negrar, Verona, Italy
| | - Richard S. Bradbury
- Division of Parasitic Diseases and Malaria, Parasitic Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
- * E-mail:
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