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Short Answers to Hard Questions About Zika Virus

The Centers for Disease Control and Prevention have warned pregnant women against travel to several countries in the Caribbean and Latin America where theZika virus is spreading. Infection with the virus appears to be linked to the development of unusually small heads and brain damage in newborns. Some pregnant women who have been to these regions should be tested for the infection, the agency also says. Here are some answers and advice about the outbreak.