 The current stretch of historic heat is doing more than just smashing records in the U.S. It's resulting in more Americans getting infected with a tropical disease. States as far north as Illinois and New York now seeing cases of dengue fever. Nearly 200 infections now confirmed in New York and New Jersey alone. More than 2,500 across the U.S. and Puerto Rico, five times higher than this time last year. ABC's Rhiannon Alley.