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Maintaining Aedes aegypti Mosquitoes Infected with Wolbachia
Published on: August 14, 2017
Comparison of Oviposition and Adult Trapping to Monitor wMel Introgression for Wolbachia-Based Vector Control
Elisabeth Nelson1, Thiago N Pereira2, Erica Milena de Castro Ribeiro2
1Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, Connecticut, USA.
The American Journal of Tropical Medicine and Hygiene
|July 21, 2026
Summary
Oviposition traps (ovitraps) offer a cost-effective method for monitoring Wolbachia mosquito populations, crucial for dengue prevention. This study confirms ovitraps provide accurate, low-resource surveillance comparable to standard BG-Sentinel traps.
Area of Science:
- Vector-borne disease control
- Entomology and Parasitology
- Molecular diagnostics in public health
Background:
- Wolbachia introgression in Aedes aegypti mosquitoes is a promising dengue prevention strategy.
- Current World Mosquito Program (WMP) surveillance relies on labor-intensive and costly BG-Sentinel traps (BG-traps).
- Affordable oviposition traps (ovitraps) are potential alternatives, but their efficacy for Wolbachia surveillance requires validation.
Purpose of the Study:
- To compare the efficacy of ovitraps versus BG-traps for monitoring Wolbachia introgression in Aedes aegypti.
- To evaluate ovitrap-based surveillance as a low-resource alternative for WMP's long-term monitoring protocols.
- To assess the correlation between Wolbachia prevalence estimates from ovitrap-reared larvae and BG-trap-collected adults.
Main Methods:
- Collected Aedes aegypti eggs and adults from 124 ovitraps and 237 BG-traps across 12 clusters in Belo Horizonte, Brazil.
- Reared eggs from ovitraps to larvae (L3/L4) for wMel Wolbachia detection via quantitative polymerase chain reaction (qPCR).
- Detected wMel Wolbachia in adult mosquitoes collected from BG-traps using qPCR.
- Employed mixed-effects models and multivariate analyses to compare cluster-level introgression estimates from both trap types.
Main Results:
- wMel Wolbachia prevalence was 0.50 in larvae from ovitraps (n=3,675) and 0.45 in adults from BG-traps (n=1,244).
- Cluster-level introgression estimates derived from ovitrap larvae and BG-trap adults showed a strong correlation (Spearman's r = 0.70; P <0.001).
- Ovitrap-based predictions demonstrated strong agreement with BG-trap estimates, especially when incorporating abundance data (rs ≥0.98).
Conclusions:
- Ovitrap-based surveillance is a highly effective, low-resource alternative for monitoring Wolbachia introgression in Aedes aegypti.
- This method offers a precise and efficient approach for large-scale dengue prevention interventions in high-burden areas.
- Findings support the adoption of ovitraps for cost-effective, long-term Wolbachia surveillance, complementing existing WMP protocols.
