About Zika
Zika virus is mostly transmitted to people via Aedes aegypti and Aedes albopictus mosquitoes. It can also be spread through unprotected sexual contact or from mother to baby during pregnancy, potentially causing severe brain defects in the affected baby.
Currently, there is no mosquito-borne spread of Zika virus in Alameda County, and all cases that have been reported in the county have been travel-associated or spread sexually. Visit for surveillance for Zika in California. Two adult female Aedes aegypti mosquitoes were found in Alameda County in May of 2015. No Aedes aegypti eggs, larvae, pupae, or adults have found in Alameda County since then. CDPH has declared Alameda County at “extremely low risk” for mosquito-borne Zika transmission.
In order to avoid infection with Zika virus, avoid mosquito bites in areas where the Zika virus is actively circulating. Also, practice safe sex with people who have recently traveled to these areas. Pregnant women, those considering pregnancy, and their partners should avoid travel to areas with risk of Zika virus transmission. For the most up to date information about Zika risk areas, visit the CDC’s Zika Risk page.
For more information, please see: Zika (CDPH)