A man with Zika virus can pass it to his female or male sex partners.
In the cases CDC knows about, men had symptoms. Zika can be passed before symptoms start, while he has symptoms, and after his symptoms end.
Men without symptoms may be able to pass the virus to their sex partners, but CDC doesn’t have reports of this.
In the cases CDC knows about, the men had vaginal or anal sex without a condom.
In some of the cases CDC knows about, the men also had oral sex (mouth to penis) without a condom.
Zika virus can stay in semen longer than in blood, but we don’t know exactly how long Zika stays in semen.
Basic Prevention
Condoms can reduce the chance of getting Zika from sex if used correctly from start to finish, every time you have vaginal, anal, or oral (mouth-to-penis) sex.
Not having sex can eliminate your risk of getting Zika from sex.