![]() At least a third of people who are infected do not develop noticeable symptoms. Symptoms may begin one to fourteen days after exposure to the virus. Symptoms of COVID‑19 are variable, but often include fever, cough, headache, fatigue, breathing difficulties, and loss of smell and taste. The disease has since spread worldwide, leading to an ongoing pandemic. The first known case was identified in Wuhan, China, in December 2019. Coronavirus disease 2019 ( COVID-19) is a contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2).
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