Increasing prevalence of imipenem-resistant Pseudomonas aeruginosa and molecular typing of metallo-beta-lactamase producers in a Korean hospital.
The types of metallo-beta-lactamases (MBLs), integrons, and genetic relatedness among Pseudomonas aeruginosa were investigated with a recent high prevalence of imipenem resistance in a Korean hospital. During 2000-2003, a total of 116 non-duplicate imipenem-resistant P. aeruginosa isolates were analyzed by PCR and DNA sequencing to detect of bla (IMP-1), bla (VIM-1), bla (VIM-2), bla (SPM-1), intI 1, intI 2, and intI 3 genes. Among them, MBL-producing isolates were evaluated for genetic relatedness using pulsed-field gel electrophoresis (PFGE) profiles. Of 116 isolates, 21 (18.1%) carried bla (VIM-2) gene with the intI 1 gene. Analysis of VIM-2 procuders by PFGE grouped 21 isolates into eight different clusters. Six of eight cluster I strains, all of four cluster II strains, and all of three cluster III strains were isolated in 2000, 2002, and 2003, respectively. Data concluded that P. aeruginosa carrying bla (VIM-2) with a class 1 integron was the only type among MBLs. A hospital outbreak by VIM-2 producers occurred annually, which could be at least a part of a recent high prevalence of imipenem resistance.
Kim
In-Suk
IS
Department of Laboratory Medicine, Sungkyunkwan University School of Medicine, Seoul, Korea.
Lee
Nam Yong
NY
Ki
Chang-Seok
CS
Oh
Won Sup
WS
Peck
Kyong Ran
KR
Song
Jae-Hoon
JH
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D015169:Colony Count, Microbial; D016521:Electrophoresis, Gel, Pulsed-Field; D015378:Imipenem / Q000494:pharmacology*; D032023:Integrons; D007723:Korea; D016133:Polymerase Chain Reaction; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000201:enzymology / Q000302:isolation & purification; D018440:beta-Lactam Resistance; D001618:beta-Lactamases / Q000096:biosynthesis*
D000900:Anti-Bacterial Agents; D015378:Imipenem; D001618:beta-Lactamases