Skip to main content

Two confirmed cases of people getting Dengue virus in L.A. County from local mosquitoes, one in Pasadena and the other in Long Beach.

These are the first ever reports of locally transmitted Dengue virus in California.  All previously known cases involved persons getting Dengue from infected mosquitoes while traveling outside the U.S:

Dengue virus case in Pasadena, October 20, 2023.

Dengue virus case in Long Beach, November 1, 2023.

A statement on this case from the Mosquito and Vector Control Association of California:

MVCAC Dengue Statement.pdf


Close-up photos of Yellow fever mosquitoes
Yellow fever mosquitoes are found throughout Southern California and are vectors of Dengue, Zika, Chikungunya and Yellow fever viruses
Close-up photos of Asian Tiger Mosquitoes
Closely-related Asian tiger mosquitoes are also found in Southern California. They can transmit the same viruses.