1
|
Herrmann B, Aaziz R, Kaden R, Riedel HM, Spörndly-Nees E, Sandelin LL, Laroucau K. SNP-based high-resolution typing of Chlamydia psittaci from humans and wild birds in Sweden: circulation of the Mat116 genotype reveals the transmission mode to humans. Microbes Infect 2024; 26:105251. [PMID: 37952689 DOI: 10.1016/j.micinf.2023.105251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/29/2023] [Accepted: 11/07/2023] [Indexed: 11/14/2023]
Abstract
The incidence of Chlamydia psittaci respiratory tract infections in humans has increased in Sweden in recent years. This study aimed to identify the transmission route by genotyping C. psittaci from infected humans and birds. 42 human C. psittaci samples and 5 samples from C. psittaci-infected birds were collected. Genotyping was performed using ompA sequencing, Multi-locus sequence typing, and/or SNP-based high-resolution melting-PCR. Epidemiological data was also collected, and a phylogenetic analysis was conducted. Analysis of ompA provided limited resolution, while the SNP-based PCR analysis successfully detected the Mat116 genotype in 3/5 passerine birds and in 26/29 human cases, indicating a high prevalence of this genotype in the human population. These cases were associated with contact with wild birds, mainly through bird feeding during winter or other outdoor exposure. Human cases caused by other genotypes (psittacine and pigeon) were less common and were linked to exposure to caged birds or pigeons. The SNP-genotype Mat116 is rare, but predominated in this study. The use of SNP-based PCR provided a better understanding of the C. psittaci transmission from birds to humans compared to ompA analysis. In Sweden, human psittacosis appears mainly to be transmitted from garden birds during bird feeding in the winter season.
Collapse
Affiliation(s)
- Björn Herrmann
- Department of Clinical Microbiology, Uppsala University Hospital, SE-751 85 Uppsala, Sweden; Department of Medical Sciences, Clinical Microbiology, Uppsala University, SE-751 85 Uppsala, Sweden.
| | - Rachid Aaziz
- Anses, Laboratory for Animal Health, Bacterial Zoonosis Unit, Paris-Est University, F-94706 Maisons-Alfort, France
| | - Rene Kaden
- Department of Clinical Microbiology, Uppsala University Hospital, SE-751 85 Uppsala, Sweden; Science for Life Laboratory, Clinical Genomics Uppsala, SE-751 85 Uppsala, Sweden
| | - Hilde M Riedel
- Department of Clinical Microbiology, Uppsala University Hospital, SE-751 85 Uppsala, Sweden; Department of Medical Sciences, Clinical Microbiology, Uppsala University, SE-751 85 Uppsala, Sweden
| | - Ellinor Spörndly-Nees
- Department of Pathology and Wildlife Diseases, National Veterinary Institute (SVA), SE-751 89 Uppsala, Sweden
| | - Lisa Labbé Sandelin
- Department of Communicable Diseases and Disease Control, Region Kalmar County, SE- 391 26 Kalmar, Sweden; Department of Biology and Environmental Science, Linnaeus University, SE-391 82 Kalmar, Sweden
| | - Karine Laroucau
- Anses, Laboratory for Animal Health, Bacterial Zoonosis Unit, Paris-Est University, F-94706 Maisons-Alfort, France
| |
Collapse
|
2
|
Harvala H, Ögren J, Boman P, Riedel HM, Nilsson P, Winiecka-Krusnell J, Beser J. Cryptosporidium infections in Sweden-understanding the regional differences in reported incidence. Clin Microbiol Infect 2016; 22:1012-1013. [PMID: 27665706 DOI: 10.1016/j.cmi.2016.09.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 09/15/2016] [Accepted: 09/18/2016] [Indexed: 10/21/2022]
Affiliation(s)
- H Harvala
- Public Health Agency of Sweden, Solna, Sweden; European Programme for Public Health Microbiology Training (EUPHEM), European Centre for Disease Prevention and Control (ECDC), Stockholm, Sweden
| | - J Ögren
- Microbiology Laboratory, Division of Medical Diagnostics, Jönköping, Sweden
| | - P Boman
- Clinical Microbiology, Uppsala University Hospital, Uppsala, Sweden
| | - H M Riedel
- Clinical Microbiology, Uppsala University Hospital, Uppsala, Sweden; Department of Medical Sciences, Section of Clinical Bacteriology, Uppsala University, Uppsala, Sweden
| | - P Nilsson
- Department of Clinical Microbiology, Halland County Hospital, Halmstad, Sweden
| | | | - J Beser
- Public Health Agency of Sweden, Solna, Sweden.
| |
Collapse
|
3
|
Nelson A, Hultenby K, Hell E, Riedel HM, Brismar H, Flock JI, Lundahl J, Giske CG, Marchini G. Staphylococcus epidermidis isolated from newborn infants express pilus-like structures and are inhibited by the cathelicidin-derived antimicrobial peptide LL37. Pediatr Res 2009; 66:174-8. [PMID: 19390494 DOI: 10.1203/pdr.0b013e3181a9d80c] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Coagulase-negative staphylococci and its subtype Staphylococcus epidermidis are major indigenous Gram-positive inhabitants of the human skin. Colonization occurs in direct connection with birth and terrestrial adaptation. This study focuses on factors that may influence skin colonization of the newborn infant that relates to the immune status of both the bacteria and the host. Skin is an effective barrier against bacteria, and this function is partly mediated by the presence of antimicrobial peptides including human cathelicidin peptide LL37. Gram-positive bacteria have been described to have adhesive pili on their surface that mediates specific attachment to the host. Here, we identify, by negative staining transmission electron microscopy (EM), two different types of pilus-like structures commonly expressed on S. epidermidis isolated from newborn infants. We also show that the cathelicidin antimicrobial peptide LL37, constitutively expressed in the skin barrier of the newborn, significantly inhibited growth of S. epidermidis indicating its importance for the ecological stability of the skin microbiota. Further studies are required to elucidate molecular mechanisms of host-microbe interactions, both for the maintenance of a mutually beneficial homeostatic relationship and for the protection of self when it results in overt disease.
Collapse
Affiliation(s)
- Annika Nelson
- Department of Woman and Child Health, Karolinska Institutet, Stockholm 17176, Sweden
| | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Ostlund MR, Lindell AT, Stenler S, Riedel HM, Wirgart BZ, Grillner L. Molecular epidemiology and genetic variability of respiratory syncytial virus (RSV) in Stockholm, 2002-2003. J Med Virol 2008; 80:159-67. [PMID: 18041002 DOI: 10.1002/jmv.21066] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The epidemiology and genetic variability of circulating respiratory syncytial virus (RSV) strains in Stockholm during the season 2002-2003 were studied in consecutive RSV isolates derived from respiratory samples and diagnosed in the laboratory. Two hundred thirty-four viruses were sequenced. The samples were mainly from children under 1 year old (79%). The phylogeny of the N-terminal part of the G gene was studied after amplification and sequencing. One hundred fifty-two viruses belonged to subgroup B and 82 to subgroup A. The subgroup A viruses could be further divided into genotypes GA2 (25) and GA5 (57) and the subgroup B viruses into GB3 (137) and SAB1 (15) strains. These strains clustered with subgroup A and subgroup B strains from Kenya from the same period, as well as with strains from Great Britain from 1995 to 1998. The dominance of subgroup B strains in Stockholm during 2002-2003 is in agreement with findings from other parts of the world during the same years. Only two genotypes of subgroup A, GA2 and GA5, were circulating during this time, and GA2 has been circulating in Sweden for more than 20 years. Consecutive strains from the same individual displayed no variability in the sequenced region, which was also true of strains that had been passaged in cell cultures.
Collapse
Affiliation(s)
- Maria Rotzén Ostlund
- Department of Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden.
| | | | | | | | | | | |
Collapse
|