Weather Regulates Location, Timing, and Intensity of Dengue Virus Transmission between Humans and Mosquitoes

Area of Science:

• Environmental Science
• Epidemiology
• Public Health

Background:

• Dengue fever is a rapidly spreading mosquito-borne viral disease affecting millions globally.
• Predicting dengue outbreaks is challenging due to complex transmission dynamics.
• Understanding weather's impact on vector ecology is crucial for risk assessment and modeling.

Purpose of the Study:

• To empirically determine how local weather conditions influence dengue transmission.
• To identify specific temperature and humidity thresholds that define transmission risk.
• To develop a predictive model for dengue risk based on weather data.

Main Methods:

• Developed a high-resolution empirical profile of local weather-dengue connections in Peru.
• Utilized a 2D weather-space (temperature vs. humidity) to map transmission potential.
• Employed a classification tree to assess weather data's ability to predict dengue transmission.

Main Results:

• Dengue transmission potential is regulated by coupled temperature and humidity.
• Specific temperature ranges (e.g., >22°C for 7+ weeks) and humidity levels significantly increase risk.
• Epidemics occur within a defined "weather-space" of specific temperature-humidity combinations.

Conclusions:

• Local weather conditions, particularly temperature-humidity interactions, systematically define dengue transmission risk.
• This provides a sensitive, evidence-based approach for predicting dengue outbreaks.
• Advances understanding of disease ecology, supporting global public health policy and surveillance.