TLDR
Releasing special mosquitoes that can't spread dengue as easily led to far fewer people getting sick and needing hospital care in a city in Indonesia.
Summary
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1 Study Aim
The study set out to test whether releasing Aedes aegypti mosquitoes infected with the wMel strain of Wolbachia (a type of bacteria that makes mosquitoes less able to spread dengue virus) could lower the number of people getting sick with dengue in a real-world city setting. The researchers wanted to see if this method would work better than standard mosquito control practices and if it would reduce cases across all types of dengue virus. The study wanted to find out if releasing bacteria-infected mosquitoes could stop people from getting dengue.
2 Study Design
Researchers conducted a cluster-randomized trial in Yogyakarta, Indonesia, dividing the city into 24 areas (clusters). Twelve clusters received releases of wMel-infected Aedes aegypti mosquitoes, while the other twelve did not. All areas continued their usual mosquito control activities. People aged 3 to 45 years with recent fever who visited local clinics were enrolled and tested for dengue. The main outcome was the number of symptomatic, lab-confirmed dengue cases. The study used a test-negative design, comparing those who tested positive for dengue to those who did not. The trial included over 8,000 participants and lasted more than two years. The researchers compared neighborhoods with and without special mosquito releases to see if fewer people got dengue.
3 Findings
The study found that areas where wMel-infected mosquitoes were released had a 77% lower rate of symptomatic, lab-confirmed dengue compared to areas without releases. Hospitalizations for dengue were also much lower (an 86% reduction) in the intervention areas. The protective effect was seen against all four types of dengue virus. The results suggest that releasing Wolbachia-infected mosquitoes is a highly effective way to reduce dengue cases and hospitalizations in urban settings. The authors recommend considering this approach as a new tool for dengue control, especially in places where traditional methods have not worked well. Fewer people got sick and needed hospital care in areas with the special mosquitoes, showing this method works well to fight dengue.