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Zika virus was sexually transmitted in US, new guidelines issued

02:20

Health officials in Dallas have reported the first case of known sexual transmission of Zika virus in the current outbreak. Dallas County health officials said someone went to Venezuela, returned to the U.S infected with Zika, and that person's sexual partner, who had not traveled, also became infected. NBC medical contributor Dr. Natalie Azar explains the phenomenon and the new guidelines to TODAY.