摘要
目的 以肉汤稀释法对解脲支原体 (Uu)进行 7种抗菌药物的敏感性测定 ,并与聚合酶链反应 (PCR)方法检测四环素耐药决定子的结果进行比较 ,探讨其临床及实验意义。方法 42个Uu分离株经三次传代成纯培养物后接种于 96孔板小孔中 ,药液倍比稀释成 6 4μg/ml～ 0 0 6 μg/ml ,37℃培养 ,加药组以 72小时后仍不出现培养基由黄→红色变化的最小药物浓度为该药的最小抑菌浓度 (MIC)。根据tetM基因序列设计引物 ,采用PCR方法进行扩增 ,并对PCR产物进行酶切消化反应。结果 四环素抗菌活性较差 ,MIC≥ 8μg/ml以上的中度敏感有 1 2株 ,且美满霉素、强力霉素的MIC也多达 8μg/ml与 4μg/ml。尚未发现对三类抗菌药同时耐药的Uu分离株。 42个Uu株的tetM阳性检测率为71 4%,除 1例外均出现预期酶解片段。结论 ①Uu分离株对四环素族药敏性较差 ,临床上经四环素类反复治疗难以阴转 ,并有症状的Uu感染病例可换用另外两类抗支原体药物 ;②载有tetM的Uu株可能成为耐药株 。
Objective To determine the susceptibility of Ureaplasma urealyticum(Uu) to 7 kinds of antimicrobial agents, to compare the result with tetracycline resistant determinant(tetM) detected by PCR technique.Methods Forty two Uu isolates were subcultured for 3 generations and then cultured with drugs with a series of concentrations from 64μg/ml ～ 0 06μg/ml. MIC was determined when the color of culture medium did not change from yellow to red in 72h culture. The tetM determinant in the isolates was detected by PCR with specific primers, and PCR products were digested by Taq 1 restrictive endonuclease. Results The antimicrobial activity of tetracyclines to Uu was low. No Uu strains resistant simultaneously to 3 groups of antibiotics were found in the study. Detection rate of tetM was 71 4% with correspondent digested fragments. Conclusion The susceptibility of Uu isolates to tetracycline group was low, but higher to macrolides and fluoroquinolones. Uu strains carrying tetM determinant might become drug resistant ones which should be monitored and followed up with MIC determination.
出处
《中华皮肤科杂志》
CAS
CSCD
北大核心
1998年第3期52-55,共4页
Chinese Journal of Dermatology
