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Insecticide-treated net (ITN) use varies seasonally, peaking after rainfall and correlating with mosquito density. Understanding this pattern, especially ITN use given access, can improve malaria prevention strategies.

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Area of Science:

  • Medical Entomology
  • Public Health
  • Climate Science

Background:

  • Seasonal variation in insecticide-treated net (ITN) usage is documented but not fully understood in relation to mosquito abundance and climate.
  • Previous research has not adequately quantified ITN use seasonality while controlling for household access to ITNs.

Purpose of the Study:

  • To quantify the seasonal variation in ITN use, specifically "ITN use given access," across different rainfall patterns.
  • To identify the relationship between rainfall, mosquito density, malaria incidence, and ITN usage patterns.

Main Methods:

  • Pooled Demographic and Health Survey and Malaria Indicator Survey data from 21 countries, combined with georeferenced and climate data.
  • Developed nine rainfall typologies based on Köppen climate zones to analyze monthly ITN use, controlling for demographic and health factors.
  • Estimated odds of ITN use given access, adjusting for region, wealth, residence, year, temperature, and malaria parasitemia.

Main Results:

  • Seasonality in ITN use given access was observed across all rainfall typologies, most pronounced in arid climates.
  • Peak ITN use occurred 1-3 months post-peak rainfall, coinciding with peak malaria incidence.
  • A lag between peak rainfall and ITN use suggests mosquito density as a primary trigger for net usage.

Conclusions:

  • ITN use seasonality is strongly linked to rainfall patterns and subsequent mosquito abundance, influencing malaria transmission.
  • Findings highlight the need for targeted behavior change interventions to optimize ITN use during peak malaria transmission seasons.
  • Results can inform geospatial models predicting ITN impact on malaria transmission dynamics.