The World Health Organization (WHO) says that Zika is caused by a virus transmitted primarily by Aedes mosquitoes. Sexual transmission of Zika is also possible.
People who become infected with Zika can have symptoms including mild fever, skin rash, conjunctivitis, muscle and joint pain, and malaise or headache. These symptoms typically last for 2 to 7 days. Pregnant women, or women who want to become pregnant, must make an effort to avoid becoming infected by Zika. The Zika virus is also a cause of microcephaly and Guillian Barré syndrome.