1887

Abstract

Infection by the pandemic clone of is prevalent in southern Thailand. This study actively surveyed the incidence of infection in this area. A total of 865 isolates of was obtained from patients at Hat Yai Hospital, the main public hospital in Songkhla Province, Thailand, from 2000 to 2005. The isolates were examined by group-specific PCR (GS-PCR) specific for the pandemic clone, and for the presence of two major virulence genes, and , and the O : K serotype. Representative isolates were also examined by antibiogram pattern and DNA fingerprinting using an arbitrarily primed PCR method to determine the clonal relationships between isolates. The total number of isolates was less in 2000 and more in 2004 and 2005 than in the years 2001–2003. The increase in the numbers of infections in 2004 and 2005 was not due to the emergence of a particular clone having unique characteristics, but was probably due to climate change. From 2000 to 2003, the percentages of pandemic strains of , defined as GS-PCR-positive , was stable at 64.1, 67.5, 69.7 and 67.7 % of the total isolates each year, respectively. However, in 2004 and 2005, the percentages decreased to 56.1 and 55.5 %, respectively. The O : K serotypes of the pandemic isolates remained unchanged. The proportional decrease in infections caused by the pandemic strains are probably due to the population in this area gradually developing immunity to the pandemic clone whilst continuing to be susceptible to other strains.

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2007-12-01
2019-10-20
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