Zika Virus Prompts CDC Warning for 14 Countries Exposure to mosquito-borne Zika virus linked to birth defects in Brazil, health officials say in issuing travel alert for Central and South America and the Caribbean WebMD News from HealthDay By Steven Reinberg HealthDay Reporter FRIDAY, Jan. 15, 2016 (HealthDay News) -- U.S. health officials issued a travel warning late Friday for 14 countries and territories exposed to the mosquito-borne Zika virus, which has been linked to a torrent of birth defects in Brazil. The travel alert targets pregnant women and those who want to become pregnant and follows reports that thousands of babies in Brazil were born last year with microcephaly, a brain disorder experts associate with Zika exposure. Babies with the condition have abnormally small heads, resulting in developmental issues and in some cases death. The alert, from the U.S. Centers for Disease Control and Prevention, lists the following countries and re...