What is Zika?
Zika is a mostly mosquito-borne virus that shares some characteristics with the more familiar West Nile virus. It is carried by the Aedes mosquito, the same one that spreads chikungunya, which became an issue last year when it cropped up in North America. Zika is not a new illness, but is newly worrisome because it is spreading.
What are the symptoms?
Fever, rash, joint pain, conjunctivitis and sometimes muscle pain and headache, according to the Centers for Disease Control. "Less than half the people who are exposed develop symptoms," said Dr. Glenn...