Genetic Diversity and Emerging Trends of Mycoplasma synoviae in China: Insights from a 2024 Nationwide MLST Study

Area of Science:

• Veterinary Microbiology
• Poultry Disease Epidemiology
• Molecular Epidemiology

Background:

• Mycoplasma synoviae (MS) is a significant poultry pathogen causing economic losses in China.
• Understanding MS epidemiology is crucial for effective disease control and flock health management.

Purpose of the Study:

• To investigate the prevalence and genetic diversity of Mycoplasma synoviae in China.
• To assess the pathogenicity and antimicrobial susceptibility of circulating MS strains.
• To provide data for informed disease control and treatment strategies.

Main Methods:

• Analysis of 3215 chicken samples from 643 broiler farms across 15 Chinese provinces.
• Polymerase Chain Reaction (PCR) for MS detection.
• Multilocus Sequence Typing (MLST) and phylogenetic analysis of 18 MS isolates.
• Pathogenicity assessment and antimicrobial susceptibility testing.

Main Results:

• A 14% PCR positivity rate and a 4.0% isolation rate for MS were observed.
• Multilocus Sequence Typing identified 13 distinct sequence types (STs), indicating significant genetic diversity.
• Pathogenicity tests confirmed infectious synovitis, with no respiratory signs observed.
• Antimicrobial susceptibility testing provided data on resistance patterns to 10 antibiotics.

Conclusions:

• This study provides critical insights into the current epidemiological status and genetic makeup of MS in China.
• Findings support the development of targeted prevention strategies and optimized management practices for MS control.
• Data on antimicrobial susceptibility will guide rational drug use in poultry treatment.