Clinical isolates
One hundred isolates of ESBL-producing K.
pneumoniae from clinical specimens were studied.
They were obtained from different patients hospitalized
at Siriraj Hospital during the two periods from January
to February 2004 and from July to August 2005. The
clinical specimens included the blood (11 specimens),
the pus (16 specimens), the sputum from patients with
respiratory tract infections (20 specimens), and the
urine from patients with urinary tract infections (53
specimens). Duplicate isolates from a single patient
were identified, and only one was kept. K.
pneumoniae was identified by standard microbiological
techniques.