Martineau M, Castagnet S, Kokabi E, Tricot A, Jaÿ M, Léon A, Tardy F. Detection of Mycoplasma spp. in horses with respiratory disorders.
Equine Vet J 2023;
55:747-754. [PMID:
36572918 DOI:
10.1111/evj.13918]
[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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 12/07/2022] [Indexed: 12/28/2022]
Abstract
BACKGROUND
Bacteria belonging to the genus Mycoplasma are small-sized, have no cell walls and small genomes. They commonly cause respiratory disorders in their animal hosts. Three species have been found in the respiratory tract of horses worldwide, that is., Mycoplasma (M.) equirhinis, M. pulmonis and M. felis, but their role in clinical cases remains unclear.
OBJECTIVES
The aim of this study was to i) develop and validate tools to detect, isolate and identify different Mycoplasma spp. strains in clinical equine respiratory-tract specimens and ii) subsequently define the prevalence of the three species in France depending on sample types and horse characteristics (age, breed, sex).
STUDY DESIGN
Validation of a workflow for mycoplasma diagnosis and subsequent prevalence study.
METHODS
Mycoplasma-free tracheal wash samples spiked with numerated strains and DNA dilutions were used to validate the culture methods and real-time PCR (rt-PCR) assay. Isolated strains were identified by 16S rRNA gene sequencing. Prevalences were determined on a population of 616 horses with respiratory disorders, sampled in France in 2020.
RESULTS
In total, 104 horses (16.9%) were found to be positive for Mycoplasma spp. by at least one method. M. equirhinis was the predominant circulating species, accounting for 85% of the rt-PCR-positive samples and 98% of the 40 cultured strains.
MAIN LIMITATION
The proposed pre-enrichment procedure improves the sensitivity of detection but hinders the quantification of the initial mycoplasma load in the clinical specimens.
CONCLUSIONS
Prevalence of mycoplasma varied with age, breed, and type of sample.
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