Worry about the virus intensified earlier this year when the virus was observed being transmitted sexually. In response to the virus' spread, various governments have responded differently. Fearing the impact of a boom in babies with microcephaly, El Salvador's Deputy Health Minister strongly advised women to avoid pregnancy altogether until 2018 when the country would be better-prepared to deal with the virus.

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“We’ve now confirmed what mounting evidence has suggested, affirming our early guidance to pregnant women and their partners to take steps to avoid Zika infection and to health care professionals who are talking to patients every day," Frieden said. "We are working to do everything possible to protect the American public.”