About 3,700 new dengue infections were reported last year in the contiguous U.S., up from about 2,050 in 2023, according to the CDC. All of last year's cases were acquired abroad, except for 105 ...

With the current conditions – high humidity, frequent rain, and soaring temperatures – ideal for mosquito breeding, the Aedes aegypti mosquito, the primary vector for dengue, is thriving.

California offers a case study in how dengue is spreading in the U.S. The Aedes aegypti and Aedes albopictus mosquitoes that transmit dengue weren’t known to be in the state 25 years ago.

As summer ushers in peak mosquito season, health and vector control officials are bracing for the possibility of another year of historic rates of dengue. And with climate change, the lack of an ...