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Chikungunya virus is a vector-borne alphavirus transmitted by the bites of infected female  Ae .  aegypti  and  Ae .  albopictus . In Brazil between 2014 and 2016 almost 320 thousand autochthonous human cases were reported and in Florida numerous imported CHIKV viremic cases (> 3,800) demonstrate the potential high risk to establishment of local transmission. In the present study, we carried out a series of experiments to determine the viral dissemination and transmission rates of different Brazilian and Florida populations of  Ae .  aegypti  and  Ae .  albopictus  at 2, 5, and 13 days post-infection for the emergent Asian genotype of CHIKV. Our results show that all tested populations of  Ae .  aegypti  and  Ae .  albopictus  have a high proportion (> 0.80) of individuals with disseminated infection as early as 2 days-post exposure. We found no significant treatment effects of mosquito population origin effects on viral dissemination rates. Transmission rates had a heterogeneous pattern, with US  Ae .  aegypti  and Brazilian  Ae .  albopictus  having the highest proportion of individuals with successful infection (respectively 0.50 and 0.82 as early as 2 days-post infection). Model results found significant effects of population origin, population origin x species, population origin x days post-infection and population origin x species x days post infection.

Chikungunya virus vector competency of Brazilian and Florida mosquito vectors