TY - JOUR T1 - Neonatal intensive care unit outbreak caused by a strain of Klebsiella oxytoca resistant to aztreonam due to overproduction of chromosomal beta-lactamase. AU - Jeong,S H, AU - Kim,W M, AU - Chang,C L, AU - Kim,J M, AU - Lee,K, AU - Chong,Y, AU - Hwang,H Y, AU - Baek,Y W, AU - Chung,H K, AU - Woo,I G, AU - Ku,J Y, PY - 2001/7/20/pubmed PY - 2001/8/24/medline PY - 2001/7/20/entrez SP - 281 EP - 8 JF - The Journal of hospital infection JO - J Hosp Infect VL - 48 IS - 4 N2 - Klebsiella oxytoca strains resistant to both aztreonam and ceftriaxone were isolated from six neonates in a neonatal intensive care unit and water reservoirs of two humidifiers attached to the neonatal incubators. These isolates were assumed to be of the same clone because they were characterized by the same antimicrobial susceptibility and pulsed field gel electrophoresis patterns. It was established that the drug resistance was attributed to overproduction of chromosomally encoded Kl beta-lactamase. It was determined that an isolate (K. oxytoca H1) contained a high enzyme concentration (27microg/100microg of protein in enzyme extracts), at least 27 times higher than the control K. oxytoca N1. It was also demonstrated that isolates had a point mutation in the - 35 concensus region of the promotor gene of bla(OXY-2)leading to enzyme overproduction. Outbreaks caused by K1 hyperproducers have not previously been described. SN - 0195-6701 UR - https://www.unboundmedicine.com/medline/citation/11461129/Neonatal_intensive_care_unit_outbreak_caused_by_a_strain_of_Klebsiella_oxytoca_resistant_to_aztreonam_due_to_overproduction_of_chromosomal_beta_lactamase_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0195-6701(01)91018-7 DB - PRIME DP - Unbound Medicine ER -