Enzyme Production and Drug Resistance of Pseudomonas aeruginosa / 中华医院感染学杂志

ABSTRACT

OBJECTIVE To investigate the 16S rRNA methylases gene and AMEs of 30 strains multi-resistant Pseudomonas aeruginosa isolated from clinic work in our hospital.METHODS Collected 50 P.aeruginosa strains from two hospitals(30 strains of multi-resistant P.aeruginosa from Yantai,Shandong,20 strains of pan-drug resistant P.aeruginosa from Jiangsu),and analyzed 6 kinds of 16S rRNA methylases(armA,rmtA,rmtB,rmtC,rmtD and npmA) and 6 kinds of AMEs gene aac(3)-Ⅰ,aac(3)-Ⅱ,aac(6′)-Ⅰb,aac(6′)-Ⅱ,aac(3″)-Ⅰ,and aac(2″)-Ⅰ by PCR and sequence analysis.RESULTS Among 30 strains of multi-resistant P.aeruginosa from Yantai,the positive rate of 4 kinds of genes aac(3)-Ⅱ,aac(6′)-Ⅱ,aac(3″)-Ⅰ,and aac(2″)-Ⅰ was 20%(6/30),46.7%(14/30),36.7%(11/30) and 3.3%(1/30).The other 8 kinds genes were all negative.The total positive rate of AMEs gene was 46.7%(14/30).In 20 strains of pan-drug resistant P.aeruginosa,the positive rate of 6 kinds of genes rmtB,aac(3)-Ⅱ,aac(6′)-Ⅰb,aac(6′)-Ⅱ,aac(3″)-Ⅰ,and aac(2″)-Ⅰ was 55%(11/20),60%(12/20),35%(7/20),60%(12/20),50%(10/20) and 45%(9/20).The other 6 kinds genes were all negative.The total positive rate of AMEs gene was 95%(19/20).CONCLUSIONS It is the first report that 16S rRNA methylases gene is existed in P.aeruginosa;there is very high positive rate of AMEs genotypes in P.aeruginosa;there are differences in gene existing among two hospitals.