AYESHA RASCOE, HOST: Malaria cases not involving international travel are being reported in the U.S. for the first time in two decades, with fingers pointing at local mosquitoes for doing the infecting. Officials in Sarasota, Fla., confirmed the seventh case so far this summer. Here's Stephanie Colombini of member station WUSF. STEPHANIE COLOMBINI, BYLINE: At first, Hannah Heath thought she might have food poisoning. She was vomiting and had chills and a fever. But four days passed, and she was still really sick. HANNAH HEATH: Finally, I called my husband, and I was like, you have to take me to the ER. I think I'm dehydrated. I think I need an IV. COLOMBINI: This was in late June, and Heath hadn't yet heard that malaria cases were cropping up in the county. But the doctors at Sarasota Memorial Hospital were on the lookout, and a blood test confirmed malaria. HEATH: I was just like, you're kidding me, right? Because I haven't been outside the country. COLOMBINI: The ...