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J. Clin. Microbiol. doi:10.1128/JCM.00228-07
Copyright (c) 2007, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.

The prevalence of melioidosis in the Er-Ren River Basin, Taiwan: implications for transmission

Centers for Disease Control, Department of Health Taiwan/Institute of Veterinary Microbiology, National Chung-Hsing University, Taichung, Taiwan; Centers for Disease Control, Department of Health Taiwan, Taipei, Taiwan; Department of Biotechnology, National Kaoshiung Normal University, Kaoshiung, Taiwan; Institute of Veterinary Microbiology, National Chung-Hsing University, Taichung, Taiwan; Department of Infectious Disease, E-DA Hospital/I-Shou University, Kaoshiung, Taiwan; Section of Infectious Disease, Kaoshiung Veterans General Hospital. Kaoshiung, Taiwan

^* To whom correspondence should be addressed. Email: dan1001{at}ma31.hinet.net.

	Abstract

An increase of melioidosis cases was observed in the Er-Ren River Basin, southwestern Taiwan, from November 2001 to August 2006, as compared to other areas in Taiwan. The objective of this study was to determine the association between the level of exposure to Burkholderia pseudomallei and the incidence rate of melioidosis, and to survey the transmission modes of B. pseudomallei in the Er-Ren River Basin. The serosurveillance of melioidosis gave a 36.6%, 21.6% and 10.9% seropositive rate for the residents in regions A, B and C within the Er-Ren Basin area, respectively. Culture and PCR-based detection of B. pseudomallei from soil demonstrated that the geographical distribution of this bacterium was confined to a particular site in the region B. The distribution of seropositive titres was significantly associated with the incidence rate of melioidosis (120, 68 or 36 incidence cases per 100,000 populations in region A, B or C in 2005), whereas it did not correlate with the geographical distribution of B. pseudomallei within the soil. A survey of transmission modes showed that residents with seropositivity were linked to factors such as having confronted flooding and having walked barefoot on soil, which are potential risk factors associated with exposure to B. pseudomallei. Our findings indicated that the Er-Ren River Basin in Taiwan has the potential to become a high prevalent area for melioidosis. This is the first report that documents a high prevalence of melioidosis in an area north of 20° N latitude.

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