The San Bernardino County Department of Public Health confirmed the county’s first locally acquired human case of the mosquito-borne illness dengue.

Then, in October 2023, an email came from the Pasadena Public Health Department: A person in the city had contracted California’s first-known case of dengue from a local mosquito. “When it happens in ...

So far this year, authorities have identified at least 13 cases of locally acquired dengue, up from two in 2023, with two in ...