Gram-negative bacteria especially Enterobacteriaceae species have become an increasing etiologic agent of
nosocomial infections. The development of resistance to
carbapenems have become an increasing problem in the treatment of
nosocomial infections. Especially carbapenamases are common for Enterobacteriaceae strains. This study was performed to detect the types of carbapenemases in Enterobacteriaceae strains isolated from various clinical samples. Enterobacteriaceae species were isolated from urine, blood, tracheal aspirates,
wound, and other respiratory samples. Susceptibility of isolates to
imipenem,
meropenem and
ertapenem was tested.
Carbapenemase genes were studied using HyplexSuperBug ID kit. VIM (1-13),
IMP (1-22), NDM-1, KPC(1-10) and OXA-48 genes were investigated. Ninety-five isolates of Enterobacteriaceae spp. were included in the study. Sixty isolates were resistant to
imipenem,
meropenem and
ertapenem and 20 isolates were found resistant to
imipenem or
ertapenem while 15 were susceptible to all
carbapenems. Among the isolates with
carbapenem resistance, 57 were positive for one
carbapenemase gene and susceptible isolates did not have
carbapenemase gene. OXA-48 was found in 49 of the isolates (86%), NDM-1 in 6 (10.5%) isolates, VIM in 2 isolates.
IMP and KPC gene loci were not identified.
Carbapenemase genes play a crucial role in the development and spread of resistant strains.