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COVID-19
COVID-19 is an infectious disease caused by a new coronavirus names SARS-CoV-2. The first patient with the disease was diagnosed in December 2019, in Wuhan, China, then the disease has caused a massive global outbreak of infection. The disease is still spreading. Globally, as of March 24, 2021, have reported more than 124 million confirmed cases and 2.736 million deaths.

Symptoms
Common symptoms of the COVID-19 include dry cough, fever, loss of taste and smell, fatigue. Most people who have mild symptoms can self-recover, which include muscle pain and soreness, runny nose, sore throat or diarrhea.

Incubation period
The disease has an incubation period of 14 days. The median incubation period is 4-5 days, and 95% of patients experiencing symptoms within 11.5 days of infection.