At least three cases of dengue fever have been reported in residents bitten by local mosquitoes in the Baldwin Park neighborhood east of downtown Los Angeles.

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.

Although the patient had no known history of travel to a dengue-endemic area, the potential risk for widespread transmission of the virus in the Los Angeles County area remains low, and no additional suspected cases of locally acquired dengue have been identified,