Detection of extended spectrum beta-lactamase genes in strains of Escherichia coli and Klebsiella pneumoniae isolated from recreational water and tertiary hospital waste water in Zaria, Nigeria

摘要

ABSTRACT Extended spectrum beta-lactamase (ESBL) producing bacteria pose a severe health risk globally. This study focused on detecting ESBL genes in Escherichia coli and Klebsiella pneumoniae isolated from a recreational water source and the waste water from a tertiary hospital in Zaria, Kaduna State, Nigeria. The isolates (twenty-two) were screened phenotypically for extended spectrum beta lactamase production using the double disk synergy test. Of the isolates, 13 (59.1) were E. coli, while 9 (40.9) were Klebsiella pneumoniae; 17 (77.3) were isolated from the waste water and 5 (22.7) were isolated from the recreational water. Six (27.2) of them showed ESBL production phenotypically; however, PCR amplification of the ESBL genes showed that only five of them had at least one of the genes. The presence of ESBL bacteria in hospital waste water and surface waters highlights that water matrices are important routes of transmission of antibiotic resistant bacteria.