title: The survival of Burkholderia pseudomallei in liquid media.
abstract: We studied the effect of environmental parameters on the survival of Burkholderia pseudomallei. There was a small increase in bacterial count for up to 28 days in sterilized distilled water or rain water, in water at 20 degrees C or 40 degrees C, and in buffered solutions of pH 4 or higher. Counts of culturable B. pseudomallei declined at pH 3, in the presence of seawater or water with concentrations of 4% salt or higher, and under refrigeration. The morphological appearances of B. pseudomallei changed under conditions that maintained culturable numbers from bacilli to coccoid cells and spiral forms under pH or salt stress. These observations indicate that B. pseudomallei can endure nutrient-depleted environments as well as a wide range of pH, salt concentrations, and temperatures for periods of up to 28 days. The relative stability of B. pseudomallei under these conditions underlines the tenacity of this species and its potential for natural dispersal in water: in surface water collections, in managed water distribution systems, and through rainfall. These survival properties help explain the recent expansion of the known melioidosis endemic zone in Australia and may have played a part in recent melioidosis outbreaks.
authors.affiliation: School of Health Sciences, Curtin University, Bentley, Western Australia. jean.robertson@postgrad.curtin.edu.au
authors.forename: Jeannie
authors.initials: J
authors.lastname: Robertson
authors.forename: Avram
authors.initials: A
authors.lastname: Levy
authors.forename: Jose-Luis
authors.initials: JL
authors.lastname: Sagripanti
authors.forename: Timothy J J
authors.initials: TJ
authors.lastname: Inglis
mesh_terms: D016957:Burkholderia pseudomallei / Q000254:growth & development*; D015169:Colony Count, Microbial; D003470:Culture Media; D006863:Hydrogen-Ion Concentration; D008854:Microscopy, Electron; D008856:Microscopy, Fluorescence; D009997:Osmotic Pressure; D012965:Sodium Chloride; D013696:Temperature; D014871:Water Microbiology
chemical_list: D003470:Culture Media; D012965:Sodium Chloride