Zika is a virus that spreads to people through two specific types of mosquitoāand both types of mosquitoes are found in certain areas of California. Zika is also sexually transmitted, so it can be passed from an infected person to his or her partner during sex. Most people with Zika donāt get sick, so they may not even know they have it. Those who do get symptoms may have fever, rash, joint pain and/or red eyes. There is no vaccine to prevent or medicine to treat Zika.