Metallo-beta-lactamase-producing Pseudomonas aeruginosa isolated from a large tertiary centre in Kenya.
This study was designed to characterize the beta-lactamase content of carbapenem-resistant Pseudomonas aeruginosa isolates recovered during 2006 and 2007 in a large tertiary-care centre in Nairobi, Kenya. Molecular characterization was done using PCR and sequencing, and typing was performed using pulsed-field gel electrophoresis (PFGE). In total, 416 P. aeruginosa isolates were obtained during that period, of which 57 (13.7%) were resistant to carbapenems. All carbapenem-resistant isolates tested positive for metallo-beta-lactamase (MBL) production. All MBL isolates produced VIM-2 with two types of integron structures. PFGE identified three clonally related groups of VIM-2-producing P. aeruginosa, including a pan-resistant clone that was responsible for nosocomial outbreaks during 2006 and 2007 in the intensive-care unit. These findings suggest that continuous molecular surveillance needs to be performed to monitor the spread within the hospital of this pan-resistant strain. This study is the first report of VIM-2-producing P. aeruginosa from the African continent.
Pitout
J D D
JD
Division of Microbiology, Calgary Laboratory Services, Department of Pathology & Laboratory Medicine, and Microbiology & Infectious Diseases, University of Calgary, Calgary, Alberta, Canada. johann.pitout@cls.ab.ca
Revathi
G
G
Chow
B L
BL
Kabera
B
B
Kariuki
S
S
Nordmann
P
P
Poirel
L
L
D000900:Anti-Bacterial Agents / Q000494:pharmacology; D015780:Carbapenems / Q000494:pharmacology; D016521:Electrophoresis, Gel, Pulsed-Field; D006785:Hospitals, University; D006801:Humans; D032023:Integrons / Q000235:genetics; D007630:Kenya / Q000453:epidemiology; D008826:Microbial Sensitivity Tests; D016133:Polymerase Chain Reaction; D011552:Pseudomonas Infections / Q000453:epidemiology* / Q000382:microbiology; D011550:Pseudomonas aeruginosa / Q000187:drug effects* / Q000201:enzymology / Q000235:genetics / Q000302:isolation & purification*; D017422:Sequence Analysis, DNA; D018440:beta-Lactam Resistance / Q000235:genetics; D001618:beta-Lactamases / Q000096:biosynthesis* / Q000235:genetics
D000900:Anti-Bacterial Agents; D015780:Carbapenems; C425108:beta-lactamase bla(vim-2); D001618:beta-Lactamases