If the infected mosquito lives long enough for the virus to multiply, the mosquito can then bite another person to pass on the virus. People who are infected but who are not sick can still pass the virus on to mosquitoes that bite them. Zika virus can also spread from a mother to her baby during pregnancy or around the time of birth. Zika virus can spread through unprotected sex, such as not using condoms during sex, from a person who has Zika to his or her sex partners, even if the infected person is not sick. The virus can also be spread through blood transfusion. Who gets Zika?