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Cholera in Bangladesh: climatic components of seasonal variation

Masahiro Hashizume1, Abu S G Faruque, Yukiko Wagatsuma

  • 1Department of International Health, Institute of Tropical Medicine (NEKKEN), The Global Center of Excellence program, Nagasaki University, Nagasaki, Japan. hashizum@nagasaki-u.ac.jp

Epidemiology (Cambridge, Mass.)
|June 22, 2010
PubMed

Insights

Climate factors like temperature and rainfall significantly influence cholera seasonality in Bangladesh. Lower temperatures correlate with reduced incidence early in the year, while rainfall patterns drive spring and monsoon peaks.

Area of Science:

  • Epidemiology
  • Environmental Health
  • Climatology

Background:

  • Cholera seasonality in Bangladesh is well-recognized but poorly understood.
  • Mechanisms driving bimodal seasonal patterns require further elucidation.

Purpose of the Study:

  • To quantify the impact of climatic factors on seasonal cholera incidence.
  • To investigate the association between weather variables and cholera cases.

Main Methods:

  • Utilized Poisson regression models to analyze weekly cholera patient data in Dhaka (1983-2008).
  • Estimated the contribution of temperature, high rainfall, and low rainfall to seasonal variations.
  • Calculated fractions of cholera cases attributed to weather factors at minimum risk levels.

Main Results:

  • Lower temperatures were associated with decreased cholera incidence in early spring.
  • Low rainfall predicted a spring peak, while high rainfall predicted a late monsoon peak.
  • Combined weather factors demonstrated a bimodal pattern consistent with observed data; rainfall explained 18-25% of seasonal peaks.

Conclusions:

  • Temperature and rainfall play complex roles in cholera seasonality.
  • Unmeasured environmental or behavioral factors likely interact with climatic influences.
Abstract

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