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Fatima SA, Gonuguntla HN, Muthappa PN, Sarangi LN. Molecular detection of Anaplasma, Babesia, Theileria, and Trypanosoma infection in cattle and buffaloes in India. J Parasit Dis 2024; 48:450-459. [PMID: 39145369 PMCID: PMC11319688 DOI: 10.1007/s12639-024-01673-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Accepted: 04/14/2024] [Indexed: 08/16/2024] Open
Abstract
Tick-borne pathogens pose a significant global threat, causing substantial economic losses to the dairy industry. In India, tropical theileriosis, anaplasmosis, babesiosis, and trypanosomiasis are major hemo-parasitic diseases affecting bovines. A cross-sectional study was conducted to determine the prevalence of hemo-parasites in different farms in India. PCR assays were employed to detect carrier status, using gene targets msp1b, tams1, rap-1, ama1, and ITS1 for A. marginale, T. annulata, B. bovis, B. bigemina, and Trypanosoma species, respectively. Out of the 578 apparently healthy animals screened, 30.45% (95% CI: 26.84-34.32%) were infected with at least one hemo-parasite. Cattle showed an overall positivity of 32.87%, while buffaloes had a prevalence of 15.19%, which was statistically significant (p < 0.001). Interestingly, prevalence was higher in indigenous cattle (47.81%) compared to cross-breeds (25.53%) and exotics (14.62%), with a statistically significant difference (p < 0.001). The prevalence of hemo-parasites varied widely among the farms, ranging from 5.77 to 100%. A. marginale was the most prevalent parasite (23.70% of animals), followed by T. annulata (13.67%), Babesia species (1.90%), and Trypanosoma species (1.56%). Enzootic instability was observed in six of the eight farms, indicating a potential for future outbreaks. Co-infection was detected in 60 out of 176 animals positive for hemo-parasites, with 59 animals co-infected with A. marginale and T. annulata, and only one cross-breed cattle infected with both Anaplasma marginale and Babesia bigemina. The findings highlight the prevalence of hemo-parasites in farms, underscoring the need for whole-herd screening, treatment of infected animals, and improvement in farm management practices to prevent production losses caused by these pathogens. Supplementary Information The online version contains supplementary material available at 10.1007/s12639-024-01673-3.
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Affiliation(s)
- Syeda Afshan Fatima
- National Dairy Development Board Research and Development Laboratory, National Dairy Development Board, IIL Campus, Gachibowli, Hyderabad, Telangana 500032 India
| | - Hariprasad Naidu Gonuguntla
- National Dairy Development Board Research and Development Laboratory, National Dairy Development Board, IIL Campus, Gachibowli, Hyderabad, Telangana 500032 India
| | - Ponnanna Nadikerianda Muthappa
- National Dairy Development Board Research and Development Laboratory, National Dairy Development Board, IIL Campus, Gachibowli, Hyderabad, Telangana 500032 India
| | - Laxmi Narayan Sarangi
- National Dairy Development Board Research and Development Laboratory, National Dairy Development Board, IIL Campus, Gachibowli, Hyderabad, Telangana 500032 India
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Mohanta UK, Abdullah SM, Al-Wasef, Chikufenji B, Ma Z, Li H, El-Sayed SAES, Amer MM, Do TT, Islam S, Nath TC, Li Y, Umemiya-Shirafuji R, Guo Q, Xuan X. First molecular survey of tick-borne protozoan and bacterial pathogens in the questing tick population in Bangladesh. Acta Trop 2024; 256:107244. [PMID: 38762942 DOI: 10.1016/j.actatropica.2024.107244] [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: 02/22/2024] [Revised: 05/04/2024] [Accepted: 05/05/2024] [Indexed: 05/21/2024]
Abstract
Questing ticks carry various tick-borne pathogens (TBPs) that are responsible for causing tick-borne diseases (TBDs) in humans and animals around the globe, especially in the tropics and sub-tropics. Information on the distribution of ticks and TBPs in a specific geography is crucial for the formulation of mitigation measures against TBDs. Therefore, this study aimed to survey the TBPs in the questing tick population in Bangladesh. A total of 2748 questing hard ticks were collected from the pastures in Sylhet, Bandarban, Sirajganj, Dhaka, and Mymensingh districts through the flagging method. After morphological identification, the ticks were grouped into 142 pools based on their species, sexes, life stages, and collection sites. The genomic DNA extracted from tick specimens was screened for 14 pathogens, namely Babesia bigemina (AMA-1), Babesia bovis (RAP-1), Babesia naoakii (AMA-1), Babesia ovis (18S rRNA), Theileria luwenshuni (18S rRNA), Theileria annulata (Tams-1), Theileria orientalis (MPSP), Anaplasma marginale (groEL), Anaplasma phagocytophilum (16S rRNA), Anaplasma bovis (16S rRNA), Anaplasma platys (16S rRNA), Ehrlichia spp. (16S rRNA), Rickettsia spp. (gltA), and Borrelia (Bo.) spp. (flagellin B) using genus and species-specific polymerase chain reaction (PCR) assays. The prevalence of the detected pathogens was calculated using the maximum likelihood method (MLE) with 95 % confidence interval (CI). Among 2748 ixodid ticks, 2332 (84.86 %) and 416 (15.14 %) were identified as Haemaphysalis bispinosa and Rhipicephalus microplus, respectively. Haemaphysalis bispinosa was found to carry all the seven detected pathogens, while larvae of R. microplus were found to carry only Bo. theileri. Among the TBPs, the highest detection rate was observed in A. bovis (20/142 pools, 0.81 %, CI: 0.51-1.20), followed by T. orientalis (19/142 pools, 0.72 %, CI: 0.44-1.09), T. luwenshuni (9/142 pools, 0.34 %, CI: 0.16-0.62), B. ovis (4/142 pools, 0.15 %, CI: 0.05 - 0.34) and Bo. theileri (4/142 pools, 0.15 %, CI: 0.05-0.34), Ehrlichia ewingii (3/142 pools, 0.11 %, CI: 0.03-0.29), and Babesia bigemina (1/142, 0.04 %, CI: 0.00 - 0.16). This study reports the existence of T. luwenshuni, E. ewingii, and Bo. theileri in Bangladesh for the first time. The novel findings of this study are the foremost documentation of transovarian transmission of B. bigemina and E. ewingii in H. bispinosa and also provide primary molecular evidence on the presence of E. ewingii and Bo. theileri in H. bispinosa. Therefore, this study may shed light on the circulating TBPs in ticks in the natural environment and thereby advocate awareness among physicians and veterinarians to control and prevent TBDs in Bangladesh.
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Affiliation(s)
- Uday Kumar Mohanta
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan; Department of Microbiology and Parasitology, Sher‒e‒Bangla Agricultural University, Sher‒e‒Bangla Nagar, Dhaka, 1207, Bangladesh
| | - S M Abdullah
- Department of Microbiology and Parasitology, Sher‒e‒Bangla Agricultural University, Sher‒e‒Bangla Nagar, Dhaka, 1207, Bangladesh
| | - Al-Wasef
- Department of Microbiology and Parasitology, Sher‒e‒Bangla Agricultural University, Sher‒e‒Bangla Nagar, Dhaka, 1207, Bangladesh
| | - Boniface Chikufenji
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan
| | - Zhuowei Ma
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan
| | - Hang Li
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan
| | - Shimaa Abd El-Salam El-Sayed
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan; Department of Biochemistry and Chemistry of Nutrition, Faculty of Veterinary Medicine, Mansoura University, Mansoura 35516, Egypt
| | - Moaz M Amer
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan
| | - Thanh Thom Do
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan
| | - Saiful Islam
- Department of Parasitology, Sylhet Agricultural University, Tilagor, Sylhet, 3100, Bangladesh
| | - Tilak Chandra Nath
- Department of Parasitology, Sylhet Agricultural University, Tilagor, Sylhet, 3100, Bangladesh
| | - Yongchang Li
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan; Laboratory of Parasitology, College of Veterinary Medicine, Xinjiang Agricultural University, Urumqi 830011, Xinjiang, PR China
| | - Rika Umemiya-Shirafuji
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan
| | - Qingyong Guo
- Laboratory of Parasitology, College of Veterinary Medicine, Xinjiang Agricultural University, Urumqi 830011, Xinjiang, PR China
| | - Xuenan Xuan
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080‒8555, Hokkaido, Japan.
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Kabir A, Shaker Chouhan C, Habib T, Pratik Siddique M, Nazir KNH, Anisur Rahman A, Amimul Ehsan M. Epidemiology of feline bartonellosis and molecular characteristics of Bartonella henselae in Bangladesh. Saudi J Biol Sci 2024; 31:103881. [PMID: 38125733 PMCID: PMC10730849 DOI: 10.1016/j.sjbs.2023.103881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/11/2023] [Accepted: 11/24/2023] [Indexed: 12/23/2023] Open
Abstract
Bartonellosis, a neglected vector-borne zoonotic disease transmitted from animals to humans, continues to threaten human and animal health significantly. This study aims to determine the epidemiology of feline bartonellosis and the molecular characteristics of Bartonella spp. in cats. From June 2018 to June 2020, 304 oral swabs were randomly collected from Bangladesh's Dhaka, Mymensingh, and Rajshahi districts. A pre-tested questionnaire was administered to collect data. Oral swabs were subjected to PCR targeting htrA gene to confirm Bartonella spp., which was subsequently validated through sequencing. Risk factors were identified using multivariable logistic regression analysis. The overall prevalence of feline bartonellosis was found to be 15.1 %. The following factors were significantly (p < 0.05) associated with Bartonella infection in risk factor analysis: cats aged ≥ 1 year (OR: 3.23, 95 % CI: 1.38-24.40), local breed cats (OR: 3.37, 95 % CI: 1.05-10.81), cats carrying fleas (OR: 2.33, 95 % CI: 1.93-13.45), antifleacidal drugs inconsistently administered cats (OR: 6.74, 95 % CI: 3.17-14.31), outdoor access cats (OR: 2.54, 95 % CI: 1.16-5.57). Notably, zoonotic B. henselae was confirmed through sequencing, establishing it as the causal agent of cat scratch disease. Phylogenetic analysis showed homology with B. henselae sequences from Brazil, Saint Kitts, and Nevis. We recommend consistent and appropriate flea control measures to curb its spread among Bangladeshi cats. Moreover, limiting outdoor exposure or implementing preventive measures for outdoor cats could reduce the disease burden. The associated human health risk can be decreased by effectively controlling this disease within the cat population.
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Affiliation(s)
- Ajran Kabir
- Department of Microbiology & Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh
| | | | - Tasmia Habib
- Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh
| | - Mahbubul Pratik Siddique
- Department of Microbiology & Hygiene, Bangladesh Agricultural University, Mymensingh, Bangladesh
| | | | - A.K.M. Anisur Rahman
- Department of Medicine, Bangladesh Agricultural University, Mymensingh, Bangladesh
| | - Md. Amimul Ehsan
- Department of Medicine, Bangladesh Agricultural University, Mymensingh, Bangladesh
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Phetkarl T, Fungwithaya P, Udompornprasith S, Amendt J, Sontigun N. Preliminary study on prevalence of hemoprotozoan parasites harbored by Stomoxys (Diptera: Muscidae) and tabanid flies (Diptera: Tabanidae) in horse farms in Nakhon Si Thammarat province, Southern Thailand. Vet World 2023; 16:2128-2134. [PMID: 38023282 PMCID: PMC10668551 DOI: 10.14202/vetworld.2023.2128-2134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 09/18/2023] [Indexed: 12/01/2023] Open
Abstract
Background and Aim Stomoxys and tabanid flies are of medical and veterinary importance because they play crucial roles in disease transmission as mechanical vectors of various hemopathogens. However, its role as a hemoprotozoan parasite vector in horse farms has not been studied. Therefore, we investigated the occurrence of hemoprotozoan parasites belonging to the genera Babesia, Theileria, and Trypanosoma in Stomoxys and tabanid flies using conventional polymerase chain reaction (PCR) and DNA sequencing. Materials and Methods All samples (Stomoxys and tabanid flies) were collected using an Nzi trap for three consecutive days each month from November 2022 to March 2023. The flies were morphologically identified to the species level and separated according to sex. Individual (for tabanid flies) or pooled samples (consisting of three specimens of Stomoxys flies of the same species and sex collected from the same site) were used for DNA extraction. Conventional PCR was used to screen for hemoprotozoan parasite DNA, followed by Sanger sequencing to identify the species. Results In total, 189 biting flies were collected, including four species of Stomoxys (Stomoxys bengalensis, Stomoxys calcitrans, Stomoxys indicus, and Stomoxys sitiens) and five species of tabanids (Atylotus cryptotaxis, Chrysops dispar, Tabanus megalops, Tabanus mesogaeus, and Tabanus rubidus). Stomoxys calcitrans was the most prevalent species, accounting for 58.7% (n = 111) of the collected flies. Ten (12.4%) of the 81 samples (individuals and pools) analyzed by PCR were positive for the 18S rRNA gene of the Theileria/Babesia species. Trypanosoma DNA was not detected in any sample. After performing Basic Local Alignment Search Tool searches and a phylogenetic analysis, only six samples (7.4%), including S. calcitrans (n = 2), S. sitiens (n = 2), T. megalops (n = 1), and A. cryptotaxis (n = 1), were found to be infected with Theileria sinensis. Furthermore, apicomplexan parasites, namely, Mattesia spp. and Colpodella spp., were found on S. indicus, the fungus Meira spp. was found on S. calcitrans, and the pathogenic green alga Helicosporidium spp. was found on A. cryptotaxis. Conclusion This study is the first to report a variety of Stomoxys and tabanid flies collected from horse farms in Thailand, which were found to be infected with Theileria and Colpodella species that affect mammals, suggesting that Stomoxys and tabanid flies can be used to confirm the presence of hemoprotozoan parasites in the study area. Understanding the presence of hemoprotozoa in flies could help design vector control programs and manage various diseases in the study area.
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Affiliation(s)
- Tanakorn Phetkarl
- Akkhraratchakumari Veterinary College, Walailak University, Nakhon Si Thammarat, 80160, Thailand
| | - Punpichaya Fungwithaya
- School of Agricultural Technology, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand
| | - Supak Udompornprasith
- Akkhraratchakumari Veterinary College, Walailak University, Nakhon Si Thammarat, 80160, Thailand
| | - Jens Amendt
- Institute of Legal Medicine, University Hospital Frankfurt, Goethe-University, Kennedyallee 104, 60596, Frankfurt am Main, Germany
| | - Narin Sontigun
- Akkhraratchakumari Veterinary College, Walailak University, Nakhon Si Thammarat, 80160, Thailand
- One Health Research Center, Walailak University, Nakhon Si Thammarat, 80160, Thailand
- Center of Excellence Research for Melioidosis and Microorganisms, Walailak University, Nakhon Si Thammarat, 80160, Thailand
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Dhakal M, Gompo TR, Devkota P, Kafle SC, Subedi JR, Gong H, Arima H, Culleton R, Asada M, Pandey K. Molecular Detection and Identification of Piroplasm in Cattle from Kathmandu Valley, Nepal. Pathogens 2023; 12:1045. [PMID: 37624005 PMCID: PMC10458267 DOI: 10.3390/pathogens12081045] [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: 07/12/2023] [Revised: 08/03/2023] [Accepted: 08/14/2023] [Indexed: 08/26/2023] Open
Abstract
BACKGROUND Tick-borne protozoan parasites (TBPPs) cause significant problems for domestic animals' health in Nepal. TBPPs are routinely diagnosed by labor-intensive blood smear microscopy. In Nepal, there are some reports of Babesia and Theileria in cattle, although species identification is rarely performed. Therefore, we performed conventional nested PCR (nPCR) followed by sequence analysis to identify TBPP species infecting cattle in Nepal. METHODS One hundred and six blood samples were collected from cattle in the Kathmandu Valley. Thin blood smears were prepared for microscopic examination. Parasite DNA was extracted from the blood, and nPCR and sequencing were performed to identify the TBPPs present. RESULTS Among the 106 samples, 45 (42.5%) were positive for piroplasm (Babesia spp. and Theileria spp.) via microscope observation and 56 (52.8%) samples were positive via nPCR. The obtained PCR products were used for direct sequencing, and we identified the species as B. bigemina, B. bovis, T. annulate and T. orientalis. Phylogenetic analyses showed that the B. bovis, B. bigemina and T. orientalis sequences from this study belonged to each species clade. On the other hand, T. annulate was divided into two clades in the analysis, and our T. annulate sequences were also divided in these two clades. The piroplasm-positive cattle showed lower hemoglobin and red blood cells than healthy cattle. CONCLUSIONS To the best of our knowledge, this study is the first to apply molecular detection and species determination of TBPPs in cattle in Nepal. The results of this study may be used as a starting point for the development of successful TBPP surveillance and prevention programs in Nepal.
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Affiliation(s)
- Medhavi Dhakal
- Central Department of Zoology, Institute of Science and Technology, Tribhuvan University, Kathmandu 44601, Nepal; (M.D.); (J.R.S.)
| | - Tulsi Ram Gompo
- Central Veterinary Laboratory, Kathmandu 44600, Nepal; (T.R.G.); (P.D.); (S.C.K.)
| | - Prakash Devkota
- Central Veterinary Laboratory, Kathmandu 44600, Nepal; (T.R.G.); (P.D.); (S.C.K.)
| | | | - Janak Raj Subedi
- Central Department of Zoology, Institute of Science and Technology, Tribhuvan University, Kathmandu 44601, Nepal; (M.D.); (J.R.S.)
| | - Haiyan Gong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai 200241, China;
| | - Hiroaki Arima
- Department of International Health and Medical Anthropology, Institute of Tropical Medicine, Nagasaki University, Nagasaki 852-8523, Japan;
| | - Richard Culleton
- Division of Molecular Parasitology, Proteo-Science Centre, Ehime University, Ehime, Matsuyama 791-0295, Japan;
| | - Masahito Asada
- Research Unit for Global Infection Control, National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan;
| | - Kishor Pandey
- Central Department of Zoology, Institute of Science and Technology, Tribhuvan University, Kathmandu 44601, Nepal; (M.D.); (J.R.S.)
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Mohanta UK, Chikufenji B, Galon EM, Ji S, Ma Z, El-Sayed SAES, Ringo AE, Do TT, Xuan X. Molecular Detection and Phylogenetic Analyses of Babesia spp. and Theileria spp. in Livestock in Bangladesh. Microorganisms 2023; 11:1563. [PMID: 37375065 DOI: 10.3390/microorganisms11061563] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Revised: 06/09/2023] [Accepted: 06/11/2023] [Indexed: 06/29/2023] Open
Abstract
Piroplasmosis, caused by Babesia spp. and Theileria spp., poses significant constraints for livestock production and upgradation in Bangladesh. Besides examining blood smears, few molecular reports are available from some selected areas in the country. Therefore, the actual scenario of piroplasmosis in Bangladesh is deficient. This study aimed to screen the piroplasms in different livestock species by molecular tools. A total of 276 blood samples were collected from cattle (Bos indicus), gayals (Bos frontalis) and goats (Capra hircus) in five geographies of Bangladesh. After that, screening was conducted through a polymerase chain reaction, and species were confirmed by sequencing. The prevalence of Babesia bigemina, B. bovis, B. naoakii, B. ovis, Theileria annulata and T. orientalis was 49.28%, 0.72%, 1.09%, 32.26%, 6.52% and 46.01%, respectively. The highest prevalence (79/109; 72.48%) of co-infections was observed with B. bigemina and T. orientalis. The phylogenetic analyses revealed that the sequences of B. bigemina (BbigRAP-1a), B. bovis (BboSBP-4), B. naoakii (AMA-1), B. ovis (ssu rRNA) and T. annulata (Tams-1) were included in one clade in the respective phylograms. In contrast, T. orientalis (MPSP) sequences were separated into two clades, corresponding to Types 5 and 7. To our knowledge, this is the first molecular report on piroplasms in gayals and goats in Bangladesh.
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Affiliation(s)
- Uday Kumar Mohanta
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
- Department of Microbiology and Parasitology, Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka 1207, Bangladesh
| | - Boniface Chikufenji
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
| | - Eloiza May Galon
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
| | - Shengwei Ji
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
| | - Zhuowei Ma
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
| | - Shimaa Abd El-Salam El-Sayed
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
| | - Aaron Edmond Ringo
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
| | - Thanh Thom Do
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
| | - Xuenan Xuan
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Hokkaido, Japan
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