Epidemiological Investigation of a Diarrhea Outbreak in the South Pacific Island Nation of Tuvalu During a Severe La Niña-Associated Drought Emergency in 2011

Am J Trop Med Hyg. 2017 Mar;96(3):576-582. doi: 10.4269/ajtmh.16-0812. Epub 2017 Apr 6.

Abstract

The association between heavy rainfall and an increased risk of diarrhea has been well established but less is known about the effect of drought on diarrhea transmission. In 2011, the Pacific island nation of Tuvalu experienced a concurrent severe La Niña-associated drought and large diarrhea outbreak. We conducted a field investigation in Tuvalu to identify factors that contributed to epidemic transmission in the context of a drought emergency. Peak case numbers coincided with the nadir of recorded monthly rainfall, the lowest recorded since 1930. Independent factors associated with increased risk of diarrhea were households with water tank levels below 20% (odds ratio [OR] = 2.31; 95% confidence interval = 1.16-4.60) and decreased handwashing frequency (OR = 3.00 [1.48-6.08]). The resolution of the outbreak occurred after implementation of a hygiene promotion campaign, despite persistent drought and limited water access. These findings are potentially important given projections that future climate change will cause more frequent and severe droughts.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Aged, 80 and over
  • Case-Control Studies
  • Child
  • Child, Preschool
  • Climate Change
  • Diarrhea / epidemiology*
  • Disease Outbreaks*
  • Droughts
  • El Nino-Southern Oscillation*
  • Family Characteristics
  • Female
  • Hand Disinfection
  • Health Promotion
  • Humans
  • Hygiene
  • Infant
  • Infant, Newborn
  • Logistic Models
  • Male
  • Micronesia / epidemiology
  • Middle Aged
  • Multivariate Analysis
  • Risk Factors
  • Young Adult