›› 2019, Vol. 46 ›› Issue (1): 231-238.doi: 10.16431/j.cnki.1671-7236.2019.01.027

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Isolation,Identification and Genetic Characterization Analysis of Streptococcus equi subsp. zooepidemicus from Horse in Xinjiang

FENG Kai1, WANG Hao1, ZHOU Tingting1, MA Xiaohui1, ENKE·Bolide2, SHE Mingjiang2, SU Yan1   

  1. 1. College of Veterinary Medicine, Xinjiang Agricultural University, Urumqi 830052, China;
    2. Ili Stud Farm of Xinjiang, Zhaosu 835600, China
  • Received:2018-06-29 Online:2019-01-20 Published:2019-01-19

Abstract:

To understand the molecular evolution and mutation of SzM gene of Streptococcus equi subsp.zooepidemicus (S.zooepidemicus) from horse in Xinjiang and provide basis for the prevention and treatment of infectious disease,lymph gland samples from sick horse were collected for bacterium culture,biochemical identification,and drug sensitivity test was also tested.The SzM gene was amplified from genomic DNA of S.zooepidemicus isolate by PCR based on the primers designed according to the published sequence in GenBank.Then the amplified SzM gene was cloned,sequenced and analyzed,and phylogenetic tree was constructed.The results showed that the isolate was Gram-positive Streptococcus,which was named as S.zooepidemicus ZMSY15-1.Drug sensitivity test showed that S.zooepidemicus ZMSY15-1 was resistant to penicillin and sulfadiazine sodium salt,and sensitive to other 14 microbials.The amino acid homologies of SzM gene of ZMSY15-1 with different strains at home and abroad were 56.0% to 70.0%.In addition,the phylogenetic analysis indicated that these test strains belonged to 4 different clades,the ZMSY15-1 isolate shared identities of 59.9% with swine isolates and they belonged to two different groups.The ZMSY15-1 isolate was closely related to US horse NH55426.The results could enrich the information data of SzM gene of S.zooepidemicus in domestic horses,and provide experimental data for the pathogenic mechanism and prevention control of S.zooepidemicus.

Key words: S.zooepidemicusi; isolation and identification; SzM gene; sequence analysis

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