Molecular characterization of Salmonella enterica Serotype Typhi isolates by pulsed-field gel electrophoresis in Hong Kong, 2000-2004.

Objective: To study Salmonella enterica serotype Typhi by pulsed-field gel electrophoresis in Hong Kong.

Materials And Methods: One hundred thirty four isolates of Salmonella enterica serotype Typhi collected from 17 public hospitals and clinics in Hong Kong from 2000 to 2004 were studied in relation to epidemiological and clinical events. Isolates originated from 80 patients, with 29 patients providing multiple isolates.

Genetic relatedness and quinolone resistance of Campylobacter jejuni strains isolated in 2002 in Hong Kong.

Pulsed-field gel electrophoresis fingerprints of 98 Campylobacter jejuni isolates from patients (85) and chicken carcasses (13) in Hong Kong in 2002 demonstrated high genetic diversity. The prevalence of quinolone resistance among the isolates was 85.9%, and replacement of the threonine-86 residue in the gyrase subunit A was the major resistance mechanism.