Betacoronavirus/genetics, Coronavirus Infections/epidemiology, Pneumonia, Viral/epidemiology, Pandemics/statistics & numerical data, Coronavirus Infections/transmission, Pneumonia, Viral/transmission, China/epidemiology, Coronavirus Infections/diagnosis, Pneumonia, Viral/diagnosis, Symptom Flare Up, Health Promotion, Quarantine/organization & administration, Social Isolation, Masks, Hand Disinfection, COVID-19