For 85 strains,the total positive rate of plasmid-mediated AmpC genes was 32.9%,and the positive rates of DHA and ACT-1 genotypes were 29.4% and 3.5%,respectively.

• 85株阴沟肠杆菌中；质粒AmpC酶基因阳性28株；阳性率32.；9%25；其中DHA和ACT-1基因阳性率分别为29