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Abstract
Abstract
Mosquito transmission of dengue viruses to humans starts with infection of skin resident cells at the biting site. There is great interest in identifying transmission-enhancing factors in mosquito saliva in order to counteract them. Here we report the discovery of high levels of subgenomic flaviviral RNA (sfRNA) in dengue virus 2-infected mosquito saliva. We show that salivary sfRNA is protected in detergent-sensitive, protease-resistant compartments. Furthermore, we show that incubation with mosquito saliva containing higher sfRNA levels results in higher virus infectivity in human cells. Since sfRNA potently inhibits innate immunity in human cells, we posit that sfRNA in mosquito saliva is present in extracellular vesicles that deliver it to cells at the biting site to inhibit innate immunity and enhance dengue virus transmission.
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