How did it get to Key Largo?

It was likely brought to the island by either a resident or a visitor who traveled to a dengue endemic area, arrived in Key Largo and was bitten there by an Aedes aegypti mosquito, which is common to the Keys. The mosquito, in turn, transmitted the virus to other humans. There have been no reported cases that have originated outside of that area or the remainder of the Florida Keys, according to health officials.

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1. What is dengue?
2. How dangerous is it?
3. How did it get to Key Largo?
4. Is it safe to travel to the Keys?