Acta Veterinaria et Zootechnica Sinica ›› 2022, Vol. 53 ›› Issue (1): 231-240.doi: 10.11843/j.issn.0366-6964.2022.01.023

• PREVENTIVE VETERINARY MEDICINE • Previous Articles     Next Articles

Identification and Evolutionary Analysis of Three Novel SeM Genotypes of Donkey Streptococcus equi subsp. equi Isolates in Xinjiang

DU Yu, PU Xiaofeng, CHEN Xiaomeng, Lü Fenfen, WANG Li, ZHANG Zehua, ZHANG Baojiang, SU Yan*   

  1. College of Animal Medicine, Xinjiang Agricultural University, Urumqi 830052, China
  • Received:2021-04-07 Online:2022-01-23 Published:2022-01-26

Abstract: Three isolates of Streptococcus subsp. equi HTP133, HTP123 and HTP232 were obtained from a donkey farm in Xinjiang. To identify the genotypingand understand the biological and epidemic characteristics of these three isolates,the biochemical characteristics analysis,drug sensitivity test and 16S rRNA sequence comparison analysis and phylogenetic tree construction were performed. The SeM alleles were amplified by PCR and sequenced for genotyping. The results showed that these three isolates were Streptococcus equi subsp.equi. These three isolates were sensitive to 18 drugs, including amoxicillin, ampicillin and gentamicin etc, whereas they are resistant to penicillin and cefuroxime. Form the 16S rRNA gene analysis and the phylogentic tree, we found that these isolated strains belonged to group I and there is an obvious variation in their variable regions of V1-V5. The homology of these three isolates are closely related with S. equi JQ726493. In addition,two new SeM genotypes, SeM 210 (HTP232) and SeM 211 (HTP133, HTP123) were identified by SeM allele analysis and they were closely related to SeM 136, SeM 138, SeM 142 and SeM 146 genotype.This work enriches the molecular biological foundation of prevalence and transmission characteristics of donkey S. equi in China and provides the theoreitical basis for the prevention and control of donkey strangles as well.

Key words: donkey Streptococcus equi subsp. equi, 16S rRNA analysis, SeM genotyping, drug sensitivity

CLC Number: