CDC on Monday issued updated interim guidance for health care providers caring for pregnant women with possible Zika virus exposure, and updated interim guidance for the prevention of sexually transmitted Zika virus. The updated guidance expands the Zika-specific blood testing window to up to 14 days in pregnant women with symptoms of infection. The guidance also advises pregnant women with exposure but no symptoms to receive this testing. "Expanding the use of the Zika-specific test could provide more women with Zika virus infection a definite diagnosis and help direct medical evaluation and care," CDC said. In addition to changes in testing recommendations, CDC's update highlighted the prevention of sexually transmitted Zika following a recently reported case of female-to-male sexual transmission of the virus in New York City. The guidance expands the definition of sexual exposure to Zika to include sex without a barrier method with any person, male or female, who has traveled to or lives in an area with Zika. The updated recommendations for pregnant couples include pregnant women with female partners who are potentially infected with Zika and offer advice for potentially infected women about how to reduce their risk of transmitting the virus to their partners.