the novel coronaviruses belong to the β genus. covid-19 is an acute respiratory infectious disease. people are generally susceptible. currently, the patients infected by the novel coronavirus are the main source of infection; asymptomatic infected people can also be an infectious source. based on the current epidemiological investigation, the incubation period is 1 to 14 days, mostly 3 to 7 days. the main manifestations include fever, fatigue and dry cough. nasal congestion, runny nose, sore throat, myalgia and diarrhea are found in a few cases.
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