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Zika virus (ZIKV) first spread into Brazil in 2013 and is now present throughout the Americas. In 2016, Florida witnessed the beginnings of local ZIKV transmission. No reports of local transmission have been reported for 2018; however, travel related cases continue to be reported. Recurrence of local transmission in the United States is a major public health risk in Florida where vectors Aedes aegypti (Diptera: Culicidae, Linnaeus) and Aedes albopictus (Diptera: Culicidae, Skuse) are abundant and there is a high potential for virus reintroduction. A dose-response study was used to evaluate susceptibility and transmission potential of Florida Ae. aegypti and Ae. albopictus to ZIKV originating from Puerto Rico. Mosquitoes were orally exposed to one of three doses of ZIKV. Higher doses of infected blood resulted in overall greater infection rates in both mosquito species. Ae. aegypti and Ae. albopictus were susceptible to infection with ZIKV and revealed a significant species by dose interaction. At low doses, Ae. aegypti was significantly less susceptible to infection with ZIKV than Ae. albopictus (6.7% and 44.4%, respectively). In contrast, at high doses, Ae. aegypti was significantly more susceptible to infection than Ae. albopictus (75.8% and 53.8%, respectively). No significant differences were observed between Ae. aegypti and Ae. albopictus in disseminated infection (0-75%) and saliva infection (0-52.4%). These observations suggest greater susceptibility to infection for Ae. albopictus at lower doses likely encountered by viremic humans. However, low disseminated infection and saliva infection for Ae. albopictus, combined with catholic feeding behavior, are likely to limit transmission potential relative to Ae. aegypti.

Florida Aedes aegypti (Diptera: Culicidae) and Aedes albopictus Vector Competency for Zika Virus