大菱鲆弧菌耐药谱、耐药基因检测和ERIC-PCR分型分析

Antimicrobial spectrum, resistance gene detection and ERIC-PCR genotyping of Vibrio scophthalmi

  • 摘要: 2020年6—10月,从辽宁地区患病大菱鲆 (Scophthalmus maximus) 体内共分离到394株菌株。基于16S rRNA序列鉴定分离株,采用微量稀释法分析随机挑选的18株大菱鲆弧菌 (Vibrio scophthalmi) 对8种抗生素的敏感性,检测其耐药基因携带情况,并基于ERIC-PCR进行分型研究。结果显示,分离株以弧菌属为主,共232株 (58.88%),其中大菱鲆弧菌117株 (29.70%)。经rpoD序列比对确定的18株大菱鲆弧菌对硫酸新霉素、氟甲喹和盐酸多西环素不耐药,对其他5种抗菌药物有不同的耐药率,多重耐药率为66.7%。18株大菱鲆弧菌共检测到酰胺醇类耐药基因floR (61.11%) 和cmlA (66.67%)、磺胺类耐药基因sul2 (55.56%)、喹诺酮类耐药基因qnrA (50%) 和qnrS (5.56%) 5种耐药基因,未检测到氨基糖苷类和四环素类耐药基因。酰胺醇类耐药基因与耐药表型符合率为88.89%,有一定的相关性。磺胺类耐药基因与耐药表型符合率次之 (50%),喹诺酮类符合率最低 (33.33%)。ERIC-PCR将该18株大菱鲆弧菌分为4个亚型,I型 (44.44%) 和III型 (44.44%) 为主要谱型,与耐药表型或耐药基因无明显相关性。根据药敏结果,防治辽宁地区大菱鲆弧菌建议首选盐酸多西环素。

     

    Abstract: From June to October of 2020, we had isolated 394 strains from diseased turbot (Scophthalmus maximus) in Liaoning Province, and identified them based on the 16S rRNA sequence. Then we randomly selected 18 Vibrio scophthalmi strains, which were further typed by enterobacterial repetitive intergenic consensus PCR (ERIC-PCR), so as to analyze the susceptibility to 8 antibiotics and the presence of drug-resistance genes. The results show that most of the isolates were Vibrio with 232 strains (58.88%), among which 117 strains (29.70%) were V. scophthalmi. The 18 strains identified by rpoD sequence alignment were not resistant to neomycin sulfate, flumequine and doxycycline hydrochloride, but resistant to other five antibiotics with different ratios. The multiple drug resistance rate was 66.7%. Five drug resistance genes in the 18 strains of V. scophthalmi were detected (Amide alcohol resistance genes floR of 61.11% and cmlA of 66.67%, sulfonamide resistance gene sul2 of 55.56%, quinolone resistance genes qnrA of 50% and qnrS of 5.56%). No aminoglycosides or tetracycline resistant genes were detected. The coincidence rate of amide alcohol resistance genes and drug resistance phenotype was 88.89%, indicating a certain correlation between them. Sulfonamide resistance genes had a coincidence rate of 50% with the resistance phenotype, and quinolones resistance genes had the lowest coincidence rate of 33.33%. Finally, we clustered the 18 strains into four types by using ERIC-PCR fingerprinting. Type I (44.44%) and Type III (44.44%) were the main clusters. We observed apparent absence of correlation between ERIC-PCR fingerprinting and the resistance phenotype or resistance genes. Thus, it is conluded that doxycycline hydrochloride can be the first choice for the control of V. scophthalmi in Liaoning aquaculture farms.

     

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