Background/Purpose: The emergence of extended-spectrum b-lactamase (ESBL) OXA-142 gene
(blaOXA-142) in Pseudomonas aeruginosa has been reported in Bulgaria and other European
countries, but rarely in Asia.
Methods: From January 2009 to December 2012, 90 P. aeruginosa isolates with reduced susceptibility
or resistance to ceftazidime (minimum inhibitory concentration 8 mg/L) were
screened for ESBL and other broad-spectrum b-lactamase genes by polymerase chain reaction
and sequencing. Clonal relationship of the isolates was determined by pulsed-field gel electrophoresis.
Results: Three isolates were positive for ESBL production, exhibited resistance to ceftazidime,
and carried the blaOXA-142 gene. The blaOXA-142 gene was integrated into class 1 integron. Using
Southern blot analysis, blaOXA-142-containing integron was found to be located on a plasmid in