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We describe the prevalence and molecular characteristics of extended-spectrum beta -lactamase (ESBL)-producing Klebsiella pneumoniae causing nosocomial bacteremia and urinary tract infections in a Mexican general hospital. We analyzed 82 episodes of bacteremia (approximately 60% of episodes) and urinary tract infection (approximately 40% of episodes) due to K. pneumoniae during a 23-month surveillance period. The neonatal intensive care unit accounted for 49% of all episodes. All strains were imipenem susceptible; 62.2% of the strains were resistant to ceftazidime, cefotaxime, and aztreonam; 69.5% were resistant to amikacin; 58.5% were resistant to gentamicin; and 7.3% were resistant to ciprofloxacin. All strains were associated with 28 pulsed-field gel electrophoresis patterns, and dissemination of 2 ceftazidime-resistant clones produced 44% of the cases. The ESBL phenotype in these clones was transferred by identical or highly related megaplasmids. The ESBL activity corresponded to SHV-5 and TLA-1. Cross-transmission of 2 ceftazidime-resistant clones and the horizontal spread of identical or highly related megaplasmids explain the high prevalence of ESBL phenotype in these infections.

clinical infectious diseases/clinical infectious diseases (online. university of chicago. press)

Nosocomial Bacteremia and Urinary Tract Infections Caused by Extended‐Spectrum β‐Lactamase–Producing<i>Klebsiella pneumoniae</i>with Plasmids Carrying Both SHV‐5 and TLA‐1 Genes

Nosocomial Bacteremia and Urinary Tract Infections Caused by Extended‐Spectrum β‐Lactamase–ProducingKlebsiella pneumoniaewith Plasmids Carrying Both SHV‐5 and TLA‐1 Genes