Frequent introductions and climate suitability drive increasing dengue risk in Florida
Taylor-Salmon, E.; Chew, Y. T.; Lopes, R.; Locksmith, T.; Kopp, E.; Vergara, J.; Davis, A.; Mitchell, M.; Colarusso, P.; Schmedes, S.; Mock, V.; Scott, B.; Zimler, R.; Vasquez, C.; Moreno, M.; Paul, L. M.; Michael, S. F.; Breban, M. I.; Vogels, C. B. F.; Warren, J. L.; Carlson, C. J.; Stanek, D.; Heberlein, L.; Hill, V.; Morrison, A.; Grubaugh, N. D.
Show abstract
In recent years, detection of local dengue cases in Florida have increased in both frequency and geographical extent. From 2022 to 2024, consecutive outbreaks in Miami-Dade County were mainly caused by a single lineage of dengue virus (DENV) serotype 3, prompting questions about changing epidemiology and a transition towards endemicity. In this study, we used mathematical modeling and genomic epidemiology to reveal the spatiotemporal dynamics and drivers of local dengue cases in Florida. We found that annual clusters and outbreaks were caused by frequent short-lived DENV introductions, primarily from the Caribbean, and did not find evidence for local trans-seasonal DENV lineage persistence. Further, we show that the climate-driven increases in local suitability for Aedes aegypti transmission and travel-associated cases were the greatest risk factors for outbreaks in Miami-Dade and the geographic expansion of dengue in Florida. Overall, while we do not yet find evidence for endemicity, we demonstrate how climatic trends are enhancing the local public health risk caused by dengue in Florida.
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