Related Experiment Video
Updated: Jun 9, 2026
Antigen-Capture Enzyme-Linked Immunosorbent Assay for Specific Detection of Mycoplasma pneumoniae
Published on: February 24, 2023
Epidemiology, Phylogenetic Divergence, and Differential Pathogenicity of Feline Respiratory Mycoplasma in China
Zijun Ye1,2,3, Congrong Wang4, Quanhui Yan1,2,3
1National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, 430070, China, hzau.edu.cn.
Abstract:
Mycoplasma felis (M. felis) is a wall-less pathogen known to induce respiratory diseases in felines. Current research on respiratory M. felis infections is scant, lacking established typing system and nationwide epidemiological survey. This study investigated the prevalence of M. felis in feline respiratory swabs (n = 4329) across China from 2022 to 2024. Coinfection profiles involving M. felis, feline herpesvirus (FHV), feline calicivirus (FCV), Chlamydia felis (C. felis), and Bordetella bronchiseptica (Bb) were assessed in 382 swab samples from cats with respiratory disease. Fifteen representative strains were isolated and characterized to provide insights for disease prevention and vaccine development. Phylogenetic analysis of these isolates revealed two novel clades: the Myco clade (exhibiting classical "fried-egg" colonies) and the Morella clade (forming "mulberry-like" microcolonies requiring supplemented media), alongside M. gateae-affiliated strains. Noteworthy strain-specific metabolic adaptations were observed. Antimicrobial susceptibility testing revealed varying macrolide susceptibility (Morella > gateae > Myco), consistent fluoroquinolone sensitivity, and emerging doxycycline resistance. In vitro virulence was strongly associated with hydrogen peroxide (H2O2)production, with Morella-type M. felis-8 and Myco-type M. felis-28 showing the highest yields. In vivo challenges in cats validated differential pathogenicity: M. felis-28 induced severe respiratory symptoms and lung histopathology (inflammatory infiltration and tissue disruption), while M. felis-8 predominantly induced conjunctival injury. Cross-protection analysis indicated limited antigenic conservation, with high autoreactivity (titer = 1:16) in strains such as M. felis-47, but minimal cross-reactivity (titer ≤ 1:2) among genetically distinct strains. These findings establish a novel diagnostic framework for distinguishing pathogenic clades, facilitating targeted therapeutic interventions and guiding rational vaccine development strategies for M. felis.
Insights
This study identifies two novel clades of Mycoplasma felis (M. felis) in feline respiratory infections, revealing distinct pathogenicities and antimicrobial resistance patterns. Findings support a new diagnostic framework and guide vaccine development for M. felis.
Area of Science:
- Veterinary Microbiology
- Feline Infectious Diseases
- Pathogen Genomics
Background:
- Mycoplasma felis (M. felis) is a significant feline respiratory pathogen, yet lacks a typing system and epidemiological data.
- Understanding M. felis diversity and pathogenicity is crucial for effective disease management and prevention in cats.
Purpose of the Study:
- To investigate the prevalence and genetic diversity of M. felis in China.
- To characterize M. felis strains, including their pathogenicity, antimicrobial susceptibility, and antigenic properties.
- To establish a framework for distinguishing M. felis clades for improved diagnostics and vaccine development.
Main Methods:
- Conducted a nationwide epidemiological survey of M. felis in feline respiratory swabs (n=4329).
- Isolated and characterized 15 M. felis strains using phylogenetic analysis, antimicrobial susceptibility testing, in vitro virulence assays (H2O2 production), and in vivo pathogenicity challenges in cats.
- Assessed coinfection profiles with other common feline respiratory pathogens (FHV, FCV, C. felis, Bb).
Main Results:
- Identified two novel M. felis clades (Myco and Morella) and M. gateae-affiliated strains.
- Demonstrated strain-specific metabolic adaptations, varying macrolide susceptibility, fluoroquinolone sensitivity, and emerging doxycycline resistance.
- Confirmed differential pathogenicity in vivo, with Myco-type M. felis-28 causing severe respiratory disease and Morella-type M. felis-8 primarily inducing conjunctival injury.
- Revealed limited cross-protection among distinct M. felis strains, suggesting strain-specific vaccine targets.
Conclusions:
- Established a novel classification system for M. felis, distinguishing pathogenic clades.
- Provided critical insights into M. felis epidemiology, antimicrobial resistance, and virulence mechanisms in felines.
- Laid the groundwork for targeted therapeutic strategies and rational vaccine development against M. felis infections.
