This graphic details the Zika virus infections among California residents from 2015 through June 30, 2017. All cases on record have been among people who were infected while traveling to areas with ongoing Zika transmission, through sexual contact with an infected traveler or through maternal-fetal transmission. No direct transmission from mosquitoes to people has been documented in California. Birth defects have been detected in seven infants infected with Zika before, during or shortly after birth.