Los Angeles County health officials say that the case was reported in a resident of El Monte and that there is no known relation between them and the other four patients.

Symptoms of dengue often mirror those of other viruses, and health officials urged healthcare providers to be vigilant.

Reports of locally-acquired dengue fever are rising in Los Angeles County, with health officials confirming a fifth case on Wednesday.

A Panorama City resident has been confirmed with a rare locally acquired case of the mosquito-borne illness dengue, making him the fourth person in the county with the virus this year, public health officials said Wednesday.