The Centers for Disease Control and Prevention today reported the first case of female-to-male sexual transmission of Zika virus, in which a New York woman apparently transmitted the virus to a male sexual partner after returning from an area with active Zika transmission. “CDC recommends that all pregnant women who have a sex partner who has traveled to or resides in an area with Zika use barrier methods every time they have sex or they should not have sex during the pregnancy,” the agency said. “Although no cases of woman-to-woman Zika transmission have been reported, these recommendations now also apply to female sex partners of pregnant women.” The agency plans to update its guidance on prevention of sexual transmission of Zika virus as more information becomes available.