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M. Shahid V. M. Ensor P. M. Hawkey 《World journal of microbiology & biotechnology》2009,25(8):1439-1446
A collection of 88 Escherichia coli and 22 Klebsiella pneumoniae strains previously studied for the carriage of bla
CTX-M-15 were screened for the presence of bla
ampC using multiplex PCR, and analysed for antibiotic resistance and co-carriage of bla
ampC and bla
CTX-M-15. Cefoxitin resistance was noticed in total of 41.8% isolates. Concomitant resistance to third and fourth generation cephalosporins,
aztreonam, gentamicin, trimethoprim and ciprofloxacin was noted. A total of 20% (22/110) isolates (14.5% E. coli and 5.5% K. pneumoniae) carried plasmidic bla
ampC of the CIT-family. Sequencing of the representative isolates revealed CMY-6 AmpC-beta-lactamase. Simultaneous occurrence
of bla
ampC and bla
CTX-M was noticed in 77.3% (17/22) isolates. Plasmid analysis of the selected isolates showed the presence of a single plasmid
of ca. ~23 kb. Curing and transconjugation experiments provided evidence of carriage of bla
CMY and bla
CTX-M on same plasmid. RAPD typing revealed the presence of bla
CMY and bla
CTX-M in a wider range of strains of E. coli and K. pneumoniae. 相似文献
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