Yellow Fever Emergence: Role of Heterologous Flavivirus Immunity in Preventing Urban Transmission
Shinde, D. P.; Plante, J. A.; Scharton, D.; Mitchel, B.; Walker, J.; Azar, S. R.; Kroon-Campos, R.; Sacchetto, L. A.; Drumond, B. P.; Vasilakis, N.; Plante, K. S.; Weaver, S. C.
Show abstract
During major, recent yellow fever (YF) epidemics in Brazil, human cases were attributed only to spillover infections from sylvatic transmission with no evidence of human amplification. Furthermore, the historic absence of YF in Asia, despite abundant peridomestic Aedes aegypti and naive human populations, represents a longstanding enigma. We tested the hypothesis that immunity from dengue (DENV) and Zika (ZIKV) flaviviruses limits YF virus (YFV) viremia and transmission by Ae. aegypti. Prior DENV and ZIKV immunity consistently suppressed YFV viremia in experimentally infected macaques, leading to reductions in Ae. aegypti infection when mosquitoes were fed on infected animals. These results indicate that, in DENV- and ZIKV-endemic regions such as South America and Asia, flavivirus immunity suppresses YFV human amplification potential, reducing the risk of urban outbreaks. One-Sentence SummaryImmunity from dengue and Zika viruses suppresses yellow fever viremia, preventing infection of mosquitoes and reducing the risk of epidemics.
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