Suppression of Aedes mosquito populations with the boosted sterile insect technique in tropical and Mediterranean urban areas
2025
Bouyer, Jérémy | Gil, David Almenar | Mora, Ignacio Pla | Sorlí, Vicente Dalmau | Maiga, Hamidou | Mamaï, Wadaka | Claudel, Iris | Brouazin, Ronan | Yamada, Hanano | Gouagna, Louis-Clément | Rossignol, Marie | Chandre, Fabrice | Dupraz, Marlene | Simard, Frédéric | Baldet, Thierry | Lancelot, Renaud
Aedes mosquitoes are the vectors of dengue viruses and other arboviruses, which threaten billions of people all over the world. The boosted sterile insect technique (boosted SIT) is a version of SIT in which irradiated sterile males also transmit a biocide to immature stages. We describe three field trials that were run in 2021: one against Aedes aegypti in La Reunion and two against Aedes albopictus in Spain, each using pyriproxyfen as a biocide. The relative density of adults (compared to their density in control sites: without sterile male release) decreased from 1.00 to 0.09, 95% credible interval [0.06, 0.15] (La Reunion, July) and to 0.02 [0.01, 0.03] and 0.11 [0.08, 0.16] (Spain, July and October). The success rate, corresponding to the proportion of traps with suppression greater than 80%, ranged from 0.43 to 0.71 in La Reunion, from 0.26 to 1.00, and from 0.50 to 0.70 in Spain. In Spain, suppression with boosted SIT was higher than with non-boosted SIT, in 2020 and 2022. This work is in line with the predictions of the model of a better efficacy of boosted SIT compared to SIT, together with partial protection from invasion of treated areas by fertile females, paving the way for larger-scale field trials.
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