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​​Zika virus is transmitted to people primarily through the bite of infected Aedes aegypti mosquitoes (yellow fever mosquitoes) or Aedes albopictus mosquitoes (Asian tiger mosquitoes). These mosquitoes are not native to California. However, since 2011 they have been detected in several California counties. An Aedes mosquito can only transmit Zika virus after it bites a person who has this virus in their blood. To date there has been no local mosquito-borne transmission of Zika virus in California. ​Don't bring Zika home - learn how to protect yourself and your baby.

Thus far in California, Zika virus infections have been documented only in people who were infected while traveling to areas with ongoing Zika transmission, through sexual contact with an infected traveler, or through maternal-fetal transmission during pregnancy. Zika virus during pregnancy can cause microcephaly and other severe brain defects in infants. Additionally, there is an association between Zika and Guillain-Barré Syndrome, a disease affecting the nervous system.

​​ Map of CA​​​​Monthly Update on Zika Cases in California (PDF)

On the 1st Friday of the month, CDPH updates the number of travel-associated Zika infections in California. 

 Mosquito​​Map and City List of Aedes Mosquitoes in California (PDF)

On the 1st Friday of the month, CDPH updates the location of Aedes aegypti and Aedes albopictus mosquito detection sites by county/city in California.​​

globeCDC Zika Travel Information — Countries and Territories with Zika Virus Transmission​

The U.S. Centers for Disease Control and Prevention (CDC) maintains a list of countries and territories with reported mosquito-borne Zika virus transmission. 

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