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Updated: May 7, 2026
Optimized PCR-based Detection of Mycoplasma
Published on: June 20, 2011
Isolation and identification of Mycoplasma hyorhinis and virulence evaluation of its field isolates
Fan Yang1,2, Lijun Yang1,2, Xuecheng Duan1,2
1State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.
Introduction:
As a prevalent swine pathogen worldwide, Mycoplasma hyorhinis (M. hyorhinis, Mhr) is associated with various diseases, including multiple serositis, pneumonia, arthritis, and otitis media. It is also linked to the porcine respiratory disease complex (PRDC).
Methods:
M. hyorhinis prevalence in 2022 Chinese lung samples was assessed by species-specific PCR, followed by isolation and purification of field strains, followed by genetic characterization via multilocus sequence typing (MLST). Pathogenicity evaluation of three isolates (ZZ-1, GD-1 and AH-1) was evaluated using controlled piglet infection trials.
Results:
Mhr detection in clinical lung samples showed 31.77% prevalence. Three isolates (ZZ-1/ST166, GD-1/ST167, AH-1/ST144) were characterized by MLST. Piglet infection trials confirmed Mhr-induced polyserositis, pneumonia, and arthritis, with strain-dependent virulence variation observed.
Discussion:
This study confirms M. hyorhinis as a high-prevalence pathogen (31.77%) in Chinese swine herds. Animal infection models demonstrated virulence variation among different Mhr strains. These findings contribute to identifying and assessing the threats posed by different strains to pig health, guiding the development of clinical prevention and control strategies.
Insights
Mycoplasma hyorhinis (Mhr) is a widespread swine pathogen. This study found Mhr prevalence at 31.77% in China, with varying virulence among strains, impacting pig health and control strategies.
Area of Science:
- Veterinary Microbiology
- Swine Pathology
- Molecular Epidemiology
Background:
- Mycoplasma hyorhinis (Mhr) is a significant swine pathogen globally, linked to diseases like polyserositis, pneumonia, arthritis, and the porcine respiratory disease complex (PRDC).
- Understanding Mhr prevalence and strain diversity is crucial for effective disease management in swine herds.
Purpose of the Study:
- To determine the prevalence of Mhr in Chinese swine lung samples in 2022.
- To genetically characterize Mhr field isolates using multilocus sequence typing (MLST).
- To evaluate the pathogenicity and virulence variation of different Mhr strains in a piglet infection model.
Main Methods:
- Species-specific PCR was used to detect Mhr in clinical lung samples.
- Field isolates were purified, and genetic characterization was performed using MLST.
- Controlled piglet infection trials were conducted to assess pathogenicity of selected Mhr isolates.
Main Results:
- Mhr was detected in 31.77% of the analyzed Chinese lung samples.
- Three distinct Mhr isolates (ZZ-1/ST166, GD-1/ST167, AH-1/ST144) were identified and characterized by MLST.
- Piglet infection trials confirmed Mhr causes polyserositis, pneumonia, and arthritis, with significant variations in virulence observed among the tested strains.
Conclusions:
- Mycoplasma hyorhinis is a highly prevalent pathogen in Chinese swine populations, with a prevalence of 31.77%.
- Virulence varies considerably between different Mhr strains, impacting disease severity in pigs.
- These findings are essential for identifying and assessing Mhr strain-specific threats to pig health, informing targeted prevention and control strategies.
