The Centers for Disease Control and Prevention (CDC) has issued an alert recommending enhanced precautions or postponed travel for people intending to travel to regions and certain countries where Zika virus transmission is ongoing. The Zika virus is spread to people through mosquito bites. The most common symptoms of Zika virus disease are fever, rash, joint pain, and conjunctivitis. The illness is usually mild, with symptoms lasting from several days to a week. Severe disease requiring hospitalization is uncommon.