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Maintaining Aedes aegypti Mosquitoes Infected with Wolbachia
Published on: August 14, 2017
Modeling Sustained Transmission of Wolbachia among Anopheles Mosquitoes: Implications for Malaria Control in Haiti
Daniela Florez1, Alyssa J Young2, Kerlly J Bernabé2
1Department of Mathematics, Tulane University, New Orleans, LA 70118, USA.
Abstract:
Wolbachia infection in Anopheles albimanus mosquitoes can render mosquitoes less capable of spreading malaria. We developed and analyzed a mechanistic compartmental ordinary differential equation model to evaluate the effectiveness of Wolbachia-based vector control strategies among wild Anopheles mosquitoes in Haiti. The model tracks the mosquito life stages, including egg, larva, and adult (male and female). It also accounts for critical biological effects, such as the maternal transmission of Wolbachia through infected females and cytoplasmic incompatibility, which effectively sterilizes uninfected females when they mate with infected males. We derive and interpret dimensionless numbers, including the basic reproductive number and next-generation numbers. The proposed system presents a backward bifurcation, which indicates a threshold infection that needs to be exceeded to establish a stable Wolbachia infection. The sensitivity analysis ranks the relative importance of the epidemiological parameters at baseline. We simulate different intervention scenarios, including prerelease mitigation using larviciding and thermal fogging before the release, multiple releases of infected populations, and different release times of the year. Our simulations show that the most efficient approach to establishing Wolbachia is to release all the infected mosquitoes immediately after the prerelease mitigation process. Moreover, the model predicts that it is more efficient to release during the dry season than the wet season.
Insights
Wolbachia infections in Anopheles mosquitoes can reduce malaria transmission. A mathematical model shows releasing Wolbachia-infected mosquitoes post-mitigation, ideally in the dry season, is most effective for control in Haiti.
Area of Science:
- Mathematical modeling
- Vector-borne disease control
- Entomology
Background:
- Malaria remains a significant public health issue, particularly in Haiti.
- Anopheles albimanus mosquitoes are primary vectors of malaria.
- Wolbachia pipientis bacteria can reduce vector competence and lifespan.
Purpose of the Study:
- To evaluate the effectiveness of Wolbachia-based vector control strategies in Haiti.
- To analyze the dynamics of Wolbachia infection in Anopheles albimanus populations.
- To identify optimal release strategies for Wolbachia implementation.
Main Methods:
- Development of a mechanistic compartmental ordinary differential equation model.
- Inclusion of mosquito life stages (egg, larva, adult) and Wolbachia transmission dynamics (maternal, cytoplasmic incompatibility).
- Analysis of dimensionless numbers (basic reproductive number, next-generation numbers) and sensitivity analysis.
Main Results:
- The model identified a backward bifurcation, indicating a threshold for stable Wolbachia infection.
- Sensitivity analysis highlighted key epidemiological parameters influencing infection establishment.
- Simulations demonstrated that immediate post-mitigation release of Wolbachia-infected mosquitoes is most effective.
- Release during the dry season is predicted to be more efficient than during the wet season.
Conclusions:
- Wolbachia-based strategies show promise for malaria control in Anopheles mosquitoes.
- Optimized release timing and immediate post-mitigation deployment are crucial for successful Wolbachia establishment.
- Mathematical modeling provides valuable insights for designing effective vector control interventions.
