Wednesday, February 10, 2016
Zika Virus: What Happened When
A lab worker exposes his arm to Aedes aegypti mosquitoes, which transmit Zika virus, during testing in the lab at Roosevelt Hospital in Guatemala City, Guatemala.
Since it was first discovered in Uganda in 1947, Zika virus was known mostly as a short-lived and mild illness. In 2015, that all changed. An outbreak in Brazil is suspected of causing cases of a serious birth defect, microcephaly, and a potentially crippling disease, Guillain-Barre syndrome.
As the mosquito-borne illness spreads across the Americas, scientists are trying to figure out what illnesses the virus is truly responsible for and why more people are getting sick.
We've put together a timeline to track the global response to Zika virus and scientists' understanding of how it affects people, with the most recent events at the top. (
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