title: Isolates of Burkholderia pseudomallei from Northern Australia are distinct by multilocus sequence typing, but strain types do not correlate with clinical presentation.
abstract: Melioidosis is the disease caused by the saprophytic organism Burkholderia pseudomallei. Previous studies have suggested some strain tropism and differential virulence. In this study, we defined strains by multilocus sequence typing (MLST) of isolates taken from the Top End of Australia's Northern Territory and compared the results with those of other strains typed worldwide. We specifically sought clinical and geographical correlates of strain types. Among 87 Australian isolates, 48 sequence types were defined. None of the sequence types in this study has been found elsewhere in the world. Strains were distributed widely throughout the region, and the different presentations of disease, including neurological and prostatic infection, were associated with many different strains. There was excellent congruence between pulsed-field gel electrophoresis and MLST, and the two typing methods had a similar level of strain discrimination. The work suggests that host and environmental factors may be more important in determining disease presentation than infecting strain type. It is possible that the distinct but diverse strain types found in this study reflect Australia's geographical isolation over many millions of years.
authors.affiliation: Menzies School of Health Research, Darwin University, P.O. Box 41096, Casuarina NT 0811, Darwin, Australia.
authors.forename: Allen C
authors.initials: AC
authors.lastname: Cheng
authors.forename: Daniel
authors.initials: D
authors.lastname: Godoy
authors.forename: Mark
authors.initials: M
authors.lastname: Mayo
authors.forename: Daniel
authors.initials: D
authors.lastname: Gal
authors.forename: Brian G
authors.initials: BG
authors.lastname: Spratt
authors.forename: Bart J
authors.initials: BJ
authors.lastname: Currie
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics; D015373:Bacterial Typing Techniques; D016957:Burkholderia pseudomallei / Q000145:classification* / Q000235:genetics; D016521:Electrophoresis, Gel, Pulsed-Field; D006801:Humans; D008554:Melioidosis / Q000453:epidemiology* / Q000382:microbiology / Q000503:physiopathology*; D015876:Northern Territory; D017422:Sequence Analysis, DNA; D014774:Virulence
chemical_list: D001426:Bacterial Proteins