**Contributions of the authors**

E.MM, JZ: drafting of the study protocol.

EMM, JZ, BM, VN: coordination of field activities (larval survey and sensitivity testing). EMM, JZ, VN, SN, AM: Coordination of laboratory activities. EMM, JZ, VN, SN database and statistical analysis. E.MM, JZ, JMNK, FA, EHMN, BM: writing of the article and correction. BM editing of the paper.
