Mem Inst Oswaldo Cruz, Rio de Janeiro, VOLUME 115 | JUNE 2020
Seasonal population dynamic of the primary yellow fever vector Haemagogus leucocelaenus (Dyar & Shannon) (Diptera: Culicidae) is mainly influenced by temperature in the Atlantic Forest, Southeast Brazil [ACCEPTED ARTICLES / PRELIMINARY VERSION]
1Laboratório de Mosquitos Transmissores de Hematozoários, Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brasil
2Secretaria Municipal de Saúde de Nova Iguaçu, RJ, Brasil
3Laboratório de Diptera, Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brasil
4Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios, Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brasil
BACKGROUND Southeast Brazil has recently experienced a yellow fever virus (YFV) outbreak where the mosquito Haemagogus leucocelaenus was a primary vector. Climatic factors influence the abundance of mosquito vectors and arbovirus transmission.
OBJECTIVES We aimed at describing the population dynamics of Hg. leucocelaenus in a county touched by the recent YFV outbreak.
METHODS Fortnightly egg collections with ovitraps were performed from November 2012 to February 2017 in a forest in Nova Iguaçu, Rio de Janeiro, Brazil. The effects of mean temperature and rainfall on the Hg. leucocelaenus population dynamic were explored.
FINDINGS Hg. leucocelaenus eggs were continuously collected throughout the study, with a peak in the warmer months (December-March). The climatic variables had a time-lagged effect and 4 weeks before sampling was the best predictor for the positivity of ovitraps and total number of eggs collected. The probability of finding >50% positive ovitraps increased when the mean temperature was above 24˚C. The numbed of Hg. leucocelaenus eggs expressively increase when mean temperature and accumulated precipitation surpassed 27˚C and 100mm, respectively, although the effect of rainfall was less pronounced.
MAIN CONCLUSIONS Monitoring population dynamic of Hg. leucocelaenus and climatic factors in YFV risk areas, especially mean temperature, may assist in developing climate-based surveillance procedures to timely strengthening prophylaxis and control.