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Intensity of rainfall and severity of melioidosis, Australia

Bart J Currie1, Susan P Jacups

  • 1Menzies School of Health Research and Flinders University, Darwin, Northern Territory, Australia. bart@menzies.edu.au

Emerging Infectious Diseases
|January 15, 2004
PubMed

Insights

Heavy rainfall significantly increases the risk of melioidosis, a serious bacterial infection. Higher 14-day rainfall before admission was linked to increased pneumonia, septic shock, and death from melioidosis.

Area of Science:

  • Environmental Microbiology
  • Infectious Diseases Epidemiology

Background:

  • Melioidosis, caused by Burkholderia pseudomallei, is endemic in Northern Australia.
  • Environmental factors, particularly rainfall, are suspected to influence disease transmission.

Purpose of the Study:

  • To investigate the association between rainfall patterns and melioidosis risk, clinical presentation, and outcomes.

Main Methods:

  • A 12-year prospective study analyzed 318 culture-confirmed melioidosis cases.
  • Rainfall data at patient locations were correlated with clinical parameters and outcomes.

Main Results:

  • Higher median rainfall in the 14 days before admission was associated with increased mortality (211 mm vs. 110 mm).
  • Significant correlations were found between 14-day rainfall (≥125 mm) and pneumonia, bacteremia, septic shock, and death.
  • Multivariate analysis confirmed rainfall as an independent risk factor for severe melioidosis outcomes.

Conclusions:

  • Pre-admission rainfall is a significant environmental risk factor for melioidosis.
  • Heavy rainfall may increase inhalation exposure to Burkholderia pseudomallei, leading to severe disease.

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