There is a lot we don’t know yet about the Zika virus, like how it is transmitted, how many types of mosquitoes carry it, and what kinds of complications it can cause (like the connection to microcephaly and Guillain-Barré Syndrome.)
Sexual transmission is now known. The first Zika case in the U.S. has been confirmed in the Dallas area, and it was sexually transmitted by someone who had traveled to a Zika-infected area.
UPDATE: A Brazil lab has found evidence of Zika in saliva and urine. It is unknown whether the virus can be transmitted via these bodily fluids.