为了解浙江省规模化猪场患病猪副猪嗜血杆菌的耐药性,采用K-B琼脂法对73株HPS浙江株进行了18种临床药物的敏感性试验,同时应用PCR技术对11个相关耐药基因进行扩增、测序和比对分析。药敏试验结果显示:对磺胺类耐药的分离株比例高达86.30%,对四环素类、氨基糖苷类、喹诺酮类、β-内酰胺类和氯霉素类耐药的比例分别为65.75%,60.27%,50.68%,50.68%,46.58%,对大环内酯类耐药仅为28.77%。PCR分析显示:97.26%的菌株中检测到耐药基因,多重耐药的占84.93%。其中喹诺酮类耐药基因Aac(6’)-1b的检出率为76.71%,氨基糖苷类耐药基因AadA1的检出率为65.75%,磺胺类耐药基因Sul1和Sul2的检出率为45.2%和10.96%,氯霉素类耐药基因Flor、CmLA、Cat1的检出率为15.07%,8.22%,58.9%,四环素类耐药基因TetA和TetB的检出率为4.11%和49.32%,β-内酰胺类耐药基因Tem-11的检出率为35.62%,大环内酯类耐药基因ErmB的检出率为1.37%。耐药基因型和表型符合率为:磺胺类62.07%,β-内酰胺类74.29%,氯霉素类81.48%,四环素类75.00%,大环内酯类0,喹诺酮类75.68%,氨基糖苷类72.09%。因此,HPS在浙江规模化猪场对临床药物已产生了耐药性,通过耐药基因检测结果确定耐药菌株具有一定的参考价值。
This study was conducted to investigate the resistance to common antibiotics and genes of Haemophi- lus parasuis isolated from the scaled pig farms in Zhejiang province.A total of 73 Zhejiang H.parasuis isolates were tested for their resistance to 18 antibiotics by K- B method.PCR was used to detect related genes.The amplified products were sequenced and aligned.The results showed that 86.30% isolates were resistant to sulfonamides, 65.75%,60.27%,50.68%,50.68% and 46.58% isolates were resistant to tetracyclines,aminoglycosides,quino- lones,- lactam antibiotics,chloramphenicols,respectively,while only 28.77% isolates were resistant to macrolides. Resistance genes were detected in 97.26% isolates,and multiple resistance genes were found in 84.93% isolates. The rates of resistance genes Aac(6')- 1b,AadA1,Sul1,Sul2,Flor,CmLA,Cat1,TetA,TetB,Tem- 11 and ErmB were 76.71%,65.75%,45.2%,10.96%,15.07%,8.22%,58.9%,4.11%,49.32%,35.62% and 1.37%,respec- tively.The coincidence of phenotype and genotype for the isolates to resist sulfonamides,- lactam antibiotics,chlor- amphenicols,tetracyclines,macrolides,quinolones and aminoglycoside antibiotics were 62.07%,74.29%, 81. 48%,75.00%,0,75.68% and 72.09%,respectively.Therefore,H.parasuis has developed resistance to clini- cally commonly used antibiotics and the results from analysis of drug- resistant gene could be used as reference to determine resistance bacteria.
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