China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (7): 2796-2804.doi: 10.16431/j.cnki.1671-7236.2022.07.038

• Basic Veterinary Medicine • Previous Articles     Next Articles

Analysis of Resistance and Resistance Genes of Streptococcus suis Clinical Isolates to Tetracyclines

LIU Baoling1,2, CHU Pinpin1, LI Chunling1, YANG Dongxia1, JIANG Zhiyong1, ZHANG Kunli1, SONG Shuai1, GOU Hongchao1, CAI Rujian1   

  1. 1. Key Laboratory of Livestock Disease Prevention of Guangdong Province, Scientific Observation and Experiment Station of Veterinary Drugs and Diagnostic Techniques of Guangdong Province of Ministry of Agriculture and Rural Affairs, Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;
    2. College of Animal Science & Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
  • Received:2022-01-07 Online:2022-07-05 Published:2022-06-29

Abstract: 【Objective】 This study was aimed to learn the resistance of clinical isolates of Streptococcus suis in Guangdong to tetracyclines and the carriage of resistance gene.【Method】 The drug-sensitive disk diffusion method was used to analyze the tetracycline antibiotics resistance of 34 strains of Streptococcus suis isolated from Guangdong during 2016 to 2020.The tetracycline resistance genes tetA,tetC,tetD,tetM,tetO and tetX were detected by PCR.【Result】 The resistance rate of 34 strains of Streptococcus suis to tetracycline was as high as 100% (34/34),followed by minocycline 82.4% (28/34) and doxycycline 47.1% (16/34).Among 34 strains of Streptococcus suis,15 strains were triple-resistant,accounting for 44.1% (15/34),14 strains were double-resistant,accounting for 41.1% (14/34),and 5 strains were resistant to one drug,accounting for 14.7% (5/34).The results of drug resistance gene detection showed that the carrying rates of tetA,tetC,tetD,tetM,tetO and tetX genes were 0,0,0,14.7% (5/34),100% (34/34) and 0,respectively.【Conclusion】 The resistance rate of tetracycline antibiotics in clinical isolates of Streptococcus suis in Guangdong was relatively high,and the main tetracycline resistance genes carried were tetO and tetM genes.

Key words: Streptococcus suis; tetracycline antibiotics; resistance; resistance gene

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