STEVE INSKEEP, HOST:
Some other news now. Florida has the largest outbreak of locally acquired dengue in the continental U.S. in nearly a century. It's linked to the death of an elderly woman, and it is spreading. Here's Jessica Meszaros with our member station WUSF.
JESSICA MESZAROS, BYLINE: Infected mosquitoes spread dengue to people. Symptoms include high fever, headache and body pain, which is how it got the nickname break-bone fever. People typically contract it while traveling through a continent where the virus is always present, like South America, Asia or Africa. But this year, folks who got infected during their worldly adventures brought it back to the U.S., passing it on to the mosquitoes here. Now over 400 local cases have been reported in the U.S. so far, almost entirely in Florida.
EVA BUCKNER: I have not seen anything like this. It is very much unprecedented.
MESZAROS: Eva Buckner is an insect scientist at the University of Florida. She says one factor in this spread is dengue has been recently really active globally.
BUCKNER: Which allows multiple travel cases to occur in Florida.
MESZAROS: Plus, the state already has the type of mosquito that can carry dengue - Aedes aegypti. And then there was a long drought this year.
BUCKNER: Aedes aegypti has drought-resistant eggs, and so it allowed some of the eggs to build up in the environment.
MESZAROS: So when it finally rained in June, all those eggs hatched simultaneously - just in time for a hot, humid summer, which these mosquitoes thrive in. In Tampa, cases spiked because the area wasn't prepared to fight this tropical disease like they already do in more southern Florida counties. Erin Mordecai is an infectious disease researcher at Stanford University. She co-authored a study published last year that found a warming climate can increase the number of dengue transmissions.
ERIN MORDECAI: We estimate that about 18% of the global dengue burden is attributable to climate change that had already happened by 1995 to 2014, so not even including the last decade of warming.
MESZAROS: Climate change increases the chance of temperatures reaching 84 degrees in more places, which is optimal for dengue transmissions. This analysis was done on 21 countries in Latin America and Asia. But Mordecai says they're currently studying the U.S. For now, the good news is weekly cases of dengue are slowing down a bit in Florida as the state welcomes cooler, drier air.
For NPR News, I'm Jessica Meszaros in Tampa, Florida.
(SOUNDBITE OF BRANT BJORK'S "WAITING FOR A COCONUT TO DROP") Transcript provided by NPR, Copyright NPR.
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