Randomized controlled trial for traditional Chinese medicine in the prevention of novel coronavirus pneumonia (COVID-19) in high risk population

INTERVENTION: Community exposure TCM intervention group:TCM intervention;Community exposure control group:Placebo;Hospital exposure TCM intervention group:TCM intervention;Hospital exposure control group:Placebo;Community suspected TCM intervention group:TCM intervention;Community suspected control group:Placebo;Hospital suspected TCM intervention group:TCM intervention;Hospital suspected control group:Placebo; CONDITION: novel coronavirus pneumonia (COVID‐19) PRIMARY OUTCOME: Viral nucleic acid detection;CT Scan of the Lungs;Blood routine examination;Temperature;Height;Weight; SECONDARY OUTCOME: Hepatorenal function;Heart rate;Blood pressure; INCLUSION CRITERIA: 1. aged 18 to 60 years 2. to be confirmed with a exposure history of diagnosed population within last 14 days; 3. with fever, positive results of blood routine examination and positive findings in CT examination, any two in three items met.