http://www.cdc.gov/zika/

Zika virus is spread to people through mosquito bites. The most common symptoms of Zika virus disease are fever, rash, joint pain, and conjunctivitis (red eyes). The illness is usually mild with symptoms lasting from several days to a week. Severe disease requiring hospitalization is uncommon. A possible link[PDF - 1 page] between Zika virus infection in pregnant women and subsequent birth defects is being investigated in Brazil.