Is Zika Virus an STD?

Basics of Zika Virus and Sex


  • Zika can be passed through sex from a person who has Zika to his or her sex partners.
  • Sex includes vaginal, anal, oral sex, and the sharing of sex toys.
  • Zika can be passed through sex, even if the person does not have symptoms at the time.
    • It can be passed from a person with Zika before their symptoms start, while they have symptoms, and after their symptoms end.
    • Though not well documented, the virus may also be passed by a person who carries the virus but never develops symptoms.
  • Studies are underway to find out how long Zika stays in the semen and vaginal fluids of people who have Zika, and how long it can be passed to sex partners. We know that Zika can remain in semen longer than in other body fluids, including vaginal fluids, urine, and blood.

Prevention Basics

  • Condoms and other barriers* can reduce the chance of getting Zika from sex.
    • Barriers that prevent passing Zika through sex include male and female condoms and dental dams.
    • Dental dams are latex or polyurethane sheets used between the mouth and vagina or anus during oral sex.
  • To be effective, condoms should be used from start to finish, every time during vaginal, anal, and oral sex.
  • Not sharing sex toys can also reduce the risk of spreading Zika to sex partners.
  • Not having sex eliminates the risk of getting Zika from sex.

*For the purposes of this webpage, all barriers will be referred to as condoms.

What CDC is Doing

CDC and other public health partners continue to study Zika virus and how it is spread and will share new information as it becomes available. This continuing research may help us find out:

  • How common it is for Zika to be passed during sex by a man or woman.
  • If Zika can be passed through saliva during deep kissing.
  • If Zika passed to a pregnant woman during sex has a different risk for birth defects than Zika transmitted by a mosquito bite.