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Background  Between 2018 and 2020, 989 clinical specimens from pigs showing clinical signs of a variety of swine diseases in 27 provinces in China were sampled and submitted for further testing. Nested PCR targeting the 16S rRNA gene of  Mycoplasma hyopneumoniae  and subsequent sequencing were used to analyse these specimens.  Mycoplasma hyopneumoniae -positive samples were assayed by multilocus sequence typing (MLST). The aim of the study was to reveal the distribution of  M. hyopneumoniae  and determine the genotypes of  M. hyopneumoniae  in pig herds in China based on MLST.    Results  Among these 989 samples, 199 samples were  M. hyopneumoniae -positive. The  M. hyopneumoniae  positivity rate was 7.2% (35/494) in 2018, 18.4% (38/207) in 2019, and 43.8% (126/288) in 2020. In total, 47 samples were successfully assayed by MLST. Sixteen new  M. hyopneumoniae  sequence types from 9 provinces were recorded in the present study.    Conclusions  This is the first report on sample positivity rates and molecular typing results for  M. hyopneumoniae  in swine herds in China. MLST has revealed high genotype diversity among  M. hyopneumoniae  from different provinces of China.

Genotype diversity of Mycoplasma Hyopneumoniae in Chinese swine herds based on multilocus sequence typing