Low Aedes aegypti Vector Competence for Zika Virus from Viremic Rhesus Macaques.

Abstract:

:Despite worldwide efforts to understand the transmission dynamics of Zika virus (ZIKV), scanty evaluation has been made on the vector competence of Aedes aegypti fed directly on viremic human and non-human primates (NHPs). We blood-fed Ae. aegypti from two districts in Rio de Janeiro on six ZIKV infected pregnant rhesus macaques at several time points, half of which were treated with Sofosbuvir (SOF). Mosquitoes were analyzed for vector competence after 3, 7 and 14 days of incubation. Although viremia extended up to eight days post monkey inoculation, only mosquitoes fed on the day of the peak of viremia, recorded on day two, became infected. The influence of SOF treatment could not be assessed because the drug was administered just after mosquito feeding on day two. The global infection, dissemination and transmission rates were quite low (4.09%, 1.91% and 0.54%, respectively); no mosquito was infected when viremia was below 1.26 × 105 RNA copies/mL. In conclusion, Ae. aegypti vector competence for ZIKV from macaques is low, likely to be due to low viral load and the short duration of ZIKV viremia in primates suitable for infecting susceptible mosquitoes. If ZIKV infection in human and macaques behaves similarly, transmission of the Zika virus in nature is most strongly affected by vector density.

journal_name

Viruses

journal_title

Viruses

authors

Fernandes RS,David MR,De Abreu FVS,Ferreira-de-Brito A,Gardinali NR,Lima SMB,Andrade MCR,Kugelmeier T,Oliveira JM,Pinto MA,Lourenço-de-Oliveira R

doi

10.3390/v12121345

subject

Has Abstract

pub_date

2020-11-24 00:00:00

issue

12

issn

1999-4915

pii

v12121345

journal_volume

12

pub_type

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