Like the viruses that cause dengue fever and chikungunya, Zika virus is spread through the bite of infected Aedes mosquitoes, which are found throughout Hawaii. A mosquito can become infected if they bite a person who is already infected with the virus. This is why it is so important to stay away from mosquitoes when you are infected. When an infected mosquito bites a new person, that mosquito can transmit the Zika virus to that new person.
There are other ways Zika can be spread:
a. In women infected while pregnant, the Zika virus has been reported to be able to be passed to their baby, either during pregnancy or at the time of birth. Investigations are ongoing to better understand how this happens.
b. Zika virus seems to also be spread through sexual contact, from an infected man to his sexual partners. It is not yet known how long the virus can be spread this way after the infected male’s symptoms have cleared, but it appears that the virus is present in semen longer than in blood. In known cases of sexual transmission, the men had developed Zika virus symptoms [source].
c. Cases of Zika virus spreading through blood transfusion have also been reported, although these cases are still under investigation.