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Biogeography of Burkholderia pseudomallei in the Torres Strait islands of Northern Australia

Baker, Anthony, Mayo, Mark J., Owens, Leigh, Burgess, Graham, Norton, Robert, McBride, William J. H., Currie, Bart J. and Warner, Jeffrey (2013). Biogeography of Burkholderia pseudomallei in the Torres Strait islands of Northern Australia. Journal of Clinical Microbiology,51(8):2520-2525.

Document type: Journal Article
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IRMA ID bsmithxPUB205
Title Biogeography of Burkholderia pseudomallei in the Torres Strait islands of Northern Australia
Author Baker, Anthony
Mayo, Mark J.
Owens, Leigh
Burgess, Graham
Norton, Robert
McBride, William J. H.
Currie, Bart J.
Warner, Jeffrey
Journal Name Journal of Clinical Microbiology
Publication Date 2013
Volume Number 51
Issue Number 8
eISSN 1098-660X
Scopus ID 2-s2.0-84880601770
Start Page 2520
End Page 2525
Total Pages 6
Place of Publication United States of America
Publisher American Society for Microbiology
HERDC Category C1 - Journal Article (DIISR)
Abstract It has been hypothesized that biogeographical boundaries are a feature of Burkholderia pseudomallei ecology, and they impact the epidemiology of melioidosis on a global scale. This study examined the relatedness of B. pseudomallei sourced from islands in the Torres Strait of Northern Australia to determine if the geography of isolated island communities is a determinant of the organisms' dispersal. Environmental sampling on Badu Island in the Near Western Island cluster recovered a single clone. An additional 32 clinical isolates from the region were sourced. Isolates were characterized using multilocus sequence typing and a multiplex PCR targeting the flagellum gene cluster. Gene cluster analysis determined that 69% of the isolates from the region encoded the ancestral Burkholderia thailandensis-like flagellum and chemotaxis gene cluster, a proportion significantly lower than that reported from mainland Australia and consistent with observations of isolates from southern Papua New Guinea. A goodness-of-fit test indicated that there was geographic localization of sequence types throughout the archipelago, with the exception of Thursday Island, the economic and cultural hub of the region. Sequence types common to mainland Australia and Papua New Guinea were identified. These findings demonstrate for the first time an environmental reservoir for B. pseudomallei in the Torres Strait, and multilocus sequence typing suggests that the organism is not randomly distributed throughout this region and that seawater may provide a barrier to dispersal of the organism. Moreover, these findings support an anthropogenic dispersal hypothesis for the spread of B. pseudomallei throughout this region.

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Additional Notes Copyright by the American Society for Microbiology

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