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Journal of medical microbiology2020; 70(2); 001284; doi: 10.1099/jmm.0.001284

A 25-year retrospective study of Chlamydia psittaci in association with equine reproductive loss in Australia.

Abstract: is primarily a pathogen of birds but can also cause disease in other species. Equine reproductive loss caused by has recently been identified in Australia where cases of human disease were also reported in individuals exposed to foetal membranes from an ill neonatal foal in New South Wales. The prevalence of in association with equine reproductive over time and in different regions of Australia is not known. This study was conducted to detect in equine abortion cases in Australia using archived samples spanning 25 years. We tested for in 600 equine abortion cases reported in Australia between 1994 to 2019 using a real-time quantitative PCR assay targeting the 16S rRNA gene followed by high-resolution melt curve analysis. Genotyping and phylogenetic analysis was performed on positive samples. The overall prevalence of in material from equine abortion cases was 6.5 %. -positive cases were detected in most years that were represented in this study and occurred in Victoria (prevalence of 7.6 %), New South Wales (prevalence of 3.9 %) and South Australia (prevalence of 15.4 %). Genotyping and phylogenetic analysis showed that the detected in the equine abortion cases clustered with the parrot-associated 6BC clade (genotype A/ST24), indicating that infection of horses may be due to spillover from native Australian parrots. This work suggests that has been a significant agent of equine abortion in Australia for several decades and underscores the importance of taking appropriate protective measures to avoid infection when handling equine aborted material.
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Publication Date: 2020-12-02 PubMed ID: 33258756PubMed Central: PMC8131020DOI: 10.1099/jmm.0.001284Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research article discusses a retrospective study spanning 25 years, investigating the association of the Chlamydia psittaci bacteria with reproductive loss in horses in Australia.

Objectives of the Study

  • The primary goal of the study was to determine the prevalence of Chlamydia psittaci, a bacterium primarily affecting birds, in relation to reproductive loss in horses across different regions and over time in Australia.

Methodology

The researchers applied the following method in their study:

  • They examined archived samples collected over a quarter of a century, from 1994 to 2019.
  • 600 equine abortion cases in Australia were tested for the presence of Chlamydia psittaci using a quantitative PCR assay that targets the 16S rRNA gene, coupled with a high-resolution melt curve analysis.
  • Positive samples were then subjected to genotyping and phylogenetic analysis to indicate a possible origination path for the infections.

Findings of the Study

The researchers arrived at the following conclusions:

  • They found an overall prevalence of 6.5% of Chlamydia psittaci in materials derived from equine abortion cases.
  • Chlamydia positive cases were discovered across several years under the study’s consideration, in three locations – Victoria (with a prevalence of 7.6%), New South Wales (prevalence 3.9%) and South Australia (prevalence of 15.4%).
  • The bacteria detected in horses was similar to that found in parrots, suggesting cross-species infection – likely from native Australian parrots to horses.

Significance of the Findings

The study had important implications:

  • The findings suggest that Chlamydia psittaci has played a significant role in causing abortions in Australian horses for at least 25 years.
  • More attention should be focused on the handling of equine abortive material, clearly underpinning the importance of proper protective measures to avert potential infection risks.

Cite This Article

APA
Akter R, Sansom FM, El-Hage CM, Gilkerson JR, Legione AR, Devlin JM. (2020). A 25-year retrospective study of Chlamydia psittaci in association with equine reproductive loss in Australia. J Med Microbiol, 70(2), 001284. https://doi.org/10.1099/jmm.0.001284

Publication

Journal of medical microbiology
ISSN: 1473-5644
NlmUniqueID: 0224131
Country: England
Language: English
Volume: 70
Issue: 2
PII: 001284

Researcher Affiliations

Akter, Rumana
  • Department of Medicine (Royal Melbourne Hospital), The University of Melbourne, Parkville, Victoria 3010, Australia.
  • Asia Pacific Centre for Animal Health, The Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria 3010, Australia.
Sansom, Fiona M
  • Asia Pacific Centre for Animal Health, The Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria 3010, Australia.
El-Hage, Charles M
  • Asia Pacific Centre for Animal Health, The Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria 3010, Australia.
Gilkerson, James R
  • Asia Pacific Centre for Animal Health, The Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria 3010, Australia.
Legione, Alistair R
  • Asia Pacific Centre for Animal Health, The Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria 3010, Australia.
Devlin, Joanne M
  • Asia Pacific Centre for Animal Health, The Melbourne Veterinary School, The University of Melbourne, Parkville, Victoria 3010, Australia.

MeSH Terms

  • Abortion, Septic / microbiology
  • Animals
  • Bacterial Outer Membrane Proteins / genetics
  • Bird Diseases / microbiology
  • Bird Diseases / transmission
  • Chlamydophila psittaci / classification
  • Chlamydophila psittaci / genetics
  • Chlamydophila psittaci / isolation & purification
  • Female
  • Horse Diseases / epidemiology
  • Horse Diseases / microbiology
  • Horses
  • Infection Control
  • New South Wales / epidemiology
  • Parrots / microbiology
  • Phylogeny
  • Pregnancy
  • Psittacosis / epidemiology
  • Psittacosis / veterinary
  • RNA, Ribosomal, 16S / genetics
  • Retrospective Studies

Conflict of Interest Statement

The authors declare that there are no conflicts of interest.

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Citations

This article has been cited 12 times.
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