The document discusses the Zika virus, including its structure, symptoms, diagnosis, treatment and association with microcephaly and Guillain-Barré syndrome. It notes that Zika is spread primarily through mosquito bites but can also be sexually transmitted. While most infections cause mild or no symptoms, Zika infection during pregnancy can cause microcephaly in babies. There is also evidence it may be linked to Guillain-Barré syndrome in adults. Public health authorities are working to investigate and control the outbreak in Brazil and its potential links to birth defects and neurological issues.