Zika virus (ZIKV) has spread in the Americas since 2015 and the potential establishment of a sylvatic transmission cycle in the continent has been hypothesized. We evaluated vector competence of five sylvatic Neotropical mosquito species to two ZIKV isolates. Distinct batches of Haemagogus leucoceleanus, Sabethes albiprivus, Sabethes identicus, Aedes terrens and Aedes scapularis females were respectively orally challenged and inoculated intrathoracically with ZIKV. Orally challenged mosquitoes were refractory or exhibited low infection rates. Viral dissemination was detected only in Hg. leucocelaenus, but with very low rates. Virus was not detected in saliva of any mosquito orally challenged with ZIKV, regardless of viral isolate and incubation time. When intrathoracically injected, ZIKV disseminated in high rates in Hg. leucocelaenus, Sa. identicus and Sa. albpiprivus, but low transmission was detected in these species; very low dissemination and no transmission was detected in Ae. terrens and Ae. scapularis. Together these results suggest that genetically determined tissue barriers, especially in the midgut, play a vital role in inhibiting ZIKV for transmission in the tested sylvatic mosquito species. Thus, an independent enzootic transmission cycle for ZIKV in South America is very unlikely.

Department of Parasitology Faculty of Science Charles University Vinicna 7 128 44 Prague 2 Czech Republic

Laboratório de Biologia Molecular de Flavivírus Instituto Oswaldo Cruz FIOCRUZ Rio de Janeiro Brazil

Laboratório de Biologia Molecular de Parasitas e Vetores Instituto Oswaldo Cruz FIOCRUZ Rio de Janeiro Brazil

Laboratório de Mosquitos Transmissores de Hematozoários Instituto Oswaldo Cruz FIOCRUZ Rio de Janeiro Brazil

Sci Rep. 2021 Jun 10;11(1):12677. doi: 10.1038/s41598-021-91676-4. PubMed

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