This year, the incidence of dengue fever globally has been the highest on record, as countries report increasingly hot temperatures — ideal for mosquitoes that spread dengue to hatch.
Source: CDC issues dengue fever alert in the U.S.
fta, for context 2241 in 2024 (~1/2 over) vs. 3036 in 2023
A total of 2,241 cases have been reported so far this year in the U.S., including 1,498 cases in the U.S. territory of Puerto Rico, where a public health emergency was declared in March after cases exceeded historical figures. Most of the cases reported in states are travel-related, according to the CDC.
It reported 3,036 dengue cases last year in the U.S. and its territories.


