[Emergence of AmpC enzyme and antibiotics resistance in gram-negative bacilli].
OBJECTIVE
To investigate the relationship between emergence of AmpC enzyme and drug resistance in the gram-negative bacilli in Xiangya Hospital and to provide information for the treatment of antibiotics.


METHODS
The bacteria were identified; the susceptibility was determined by Microscan microbiological identification system; and the AmpC enzyme was detected by disc diffusion method.


RESULTS
Of the 204 gram-negative strains, the positive rate of AmpC enzyme was 19.61%; AmpC-positive strains resisted to ceftriaxone, piperacillin, ceftazidime, cefotaxime, cefoperazone, aztreonam, piperacillin/tazobactam, cefuroxime, ceftazidime/clavulanic, and cefotaxime/clavulanic. But AmpC-negative strains were susceptible to those antibiotics. There were significant differences, between the two groups (All P < 0.05). Both groups were susceptible to cefepime, imipenem, meropenem, cefoperazone/sulbactam, levofloxacin, and amikacin.


CONCLUSIONS
The detection of AmpC enzyme is helpful to the screen of drug resistant strains. Most bacilli with AmpC enzyme show the resistance to third-generation cephosporins, aztreonam, and the beta-lactamase inhibitors, but susceptible to imipenem, cefepime, meropenem, cefoperazone/sulbactam, levofloxacin, and amikacin, which provides the information for the antibiotic therapy.
Liu
Wen-en
WE
Department of Clinical Laboratory, Xiangya Hospital, Central South University, Changsha 410008, China. liuwenen@hotmail.com
Jiang
Yuan
Y
Tang
Yin
Y
Wang
Hong-mei
HM
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001426:Bacterial Proteins / Q000032:analysis*; D002648:Child; D002675:Child, Preschool; D004352:Drug Resistance, Microbial; D024901:Drug Resistance, Multiple, Bacterial; D005260:Female; D006090:Gram-Negative Bacteria / Q000187:drug effects* / Q000201:enzymology*; D006801:Humans; D007223:Infant; D008297:Male; D008826:Microbial Sensitivity Tests; D008875:Middle Aged; D001618:beta-Lactamases / Q000032:analysis*
D001426:Bacterial Proteins; C048795:AmpC beta-lactamases; D001618:beta-Lactamases