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Temperature explains broad patterns of Ross River virus transmission
Marta Strecker Shocket1, Sadie J Ryan2,3,4, Erin A Mordecai1
1Department of Biology, Stanford University, Stanford, United States.
Elife
|August 29, 2018
Summary
Ross River virus transmission, a mosquito-borne disease, peaks at moderate temperatures and declines at extremes. Climate warming may increase transmission in temperate regions but decrease it in the tropics.
Area of Science:
- Vector-borne disease ecology
- Climate change impact on public health
- Viral transmission dynamics
Background:
- Vector-borne disease transmission is temperature-dependent, often exhibiting optimal ranges.
- Understanding thermal limits is crucial for predicting disease spread, especially for emerging pathogens.
- Ross River virus (RRV) is a significant mosquito-borne pathogen in Australia and the Pacific, with potential for global emergence.
Purpose of the Study:
- To develop a mechanistic model for the thermal response of Ross River virus transmission.
- To identify the thermal optima and limits for RRV transmission.
- To predict the impact of climate change on RRV transmission patterns.
Main Methods:
- Constructed a mechanistic model to simulate RRV transmission across a range of temperatures.
- Validated model predictions against known transmission patterns in tropical and temperate regions.
- Analyzed the projected effects of climate warming on RRV transmission.
Main Results:
- RRV transmission exhibits a thermal optimum at 26.4°C, with transmission ceasing at 17.0°C and 31.5°C.
- The model accurately predicts year-round endemic transmission in tropical areas and seasonal transmission in temperate zones.
- Climate warming is projected to increase RRV transmission in temperate regions while decreasing it in tropical areas.
Conclusions:
- Nonlinear thermal response models are essential for understanding and predicting vector-borne disease dynamics.
- Temperature significantly influences the geographic and seasonal patterns of Ross River virus transmission.
- Climate change will likely alter the distribution and intensity of Ross River virus transmission, with varying impacts across different climatic zones.
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