Article
Zika infection decreases Aedes aegypti locomotor activity but does not influence egg production or viability
Registro en:
PADILHA, Karine Pedreira; et al. Zika infection decreases Aedes aegypti locomotor activity but does not influence egg production or viability. mem. Inst. Oswaldo Cruz, E-pub:19 jun. 2018.
0074-0276
10.1590/0074-02760180290
1676-8060
Autor
Padilha, Karine Pedreira
Resck, Maria Eduarda Barreto
Cunha, Octávio Augusto Talyuli da
Freitas, Rayane Teles de
Campos, Stéphanie Silva
Sorgine, Marcos Henrique Ferreira
Oliveira, Ricardo Lourenço de
Farnesi, Luana Cristina
Bruno, Rafaela Vieira
Resumen
Zika has emerged as a new public health threat after the explosive epidemic in Brazil in 2015. It is an arboviroses transmitted mainly by Ae. aegypti mosquitoes. The knowledge of physiological, behavioral and biological features in virus-infected vectors may help the understanding of arbovirus transmission dynamics and elucidate their influence in vector capacity. Here, we aimed to investigate the effects of Zika virus (ZIKV) infection in the behavior of Ae. aegypti females by analyzing the locomotor activity, egg production and viability. Ae. aegypti females were orally infected with ZIKV through an artificial feeder to access egg production, egg viability and locomotor activity. For egg production and viability assays, females were kept in cages containing an artificial site for oviposition and eggs were counted. No significant difference in the number of eggs laid per females neither in their viability were found between ZIKV infected and non-infected females, regardless the tested pair of mosquito population and virus strain and the gonotrophic cycles. Locomotor activity assays were performed in activity monitors, an average of 5th, 6th and 7th days after infective feeding was calculated and a significant decrease in the locomotor activity in ZIKV infected females was observed. These results suggest that even when mosquitoes are infected with ZIKV, in places where there are many oviposition sites, they are able to maintain the dissemination of the vector population. Besides, the decreased locomotor activity does not seem to influence negatively in ZIKV transmission and may explain case clustering within households reported during Zika outbreaks such as in Rio de Janeiro 2015. High mosquito infestation index and abundant vector breeding sites may also influence this disease transmission.