![]() ![]() 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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