Transmission electron micrograph (TEM) of the Zika virus. The arrow is pointing to a single virus particle. The most common symptoms of Zika virus disease are fever, rash, joint pain and conjunctivitis. Following a major outbreak in South America in 2016 – by far the largest to date – researchers think it might also cause microcephaly (underdevelopment of the head and brain) in unborn children. Previous outbreaks have occurred in Africa, South-east Asia and the Pacific Islands.
Cynthia Goldsmith/Centers for Disease Control and Prevention