Zika virus, animation. This is an RNA (ribonucleic acid) virus from the Flaviviridae family. The virus particle has an icosohedral capsid containing the genetic material, surrounded by a protein envelope. It is transmitted to humans via the bite of an infected Aedes sp. mosquito. It causes Zika fever, a mild disease with symptoms including rash, joint pain and conjunctivitis. In 2015 a previously unknown connection between Zika infection in pregnant women and microcephaly (small head) in newborns was reported. This can cause miscarriage or death soon after birth, or lead to developmental delays and disorders. This animation is also available on a white background (K005 5519) and a transparent background (K005 5523).