The disease, while rarely fatal, is painful and debilitating. Officials did not say where in the county the case occurred.

Health officials warned that the Los Angeles area is seeing more dengue fever cases in people who have not traveled outside the U.S. mainland, a year after the first such case was reported in California.

Health officials reported a single case of locally acquired dengue in Long Beach last year. Now, three such cases in Baldwin Park mark an unprecedented escalation.

“Dengue is primarily transmitted through the bite of an infected Aedes mosquito. Although Aedes mosquitoes are common in LA County, cases of locally acquired dengue are extremely rare,” Los Angeles County Public Health Director Barbara Ferrer said Wednesday.

The Department of Health did not provide any details on specifically where in Palm Beach County the agencies are focusing surveillance and prevention