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Some people continue to experience a range of effects ( long COVID) for years after infection, and damage to organs has been observed. Older people are at a higher risk of developing severe symptoms. Of those who develop symptoms noticeable enough to be classified as patients, most (81%) develop mild to moderate symptoms (up to mild pneumonia), while 14% develop severe symptoms ( dyspnea, hypoxia, or more than 50% lung involvement on imaging), and 5% develop critical symptoms ( respiratory failure, shock, or multiorgan dysfunction). 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. The symptoms of COVID‑19 are variable but often include fever, cough, headache, fatigue, breathing difficulties, loss of smell, and loss of taste. The disease quickly spread worldwide, resulting in the COVID-19 pandemic. The first known case was identified in Wuhan, China, in December 2019. Coronavirus disease 2019 ( COVID-19) is a contagious disease caused by the virus SARS-CoV-2.
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