Betacoronavirus/immunology, Coronavirus Infections/epidemiology, Pneumonia, Viral/epidemiology, Pandemics/statistics & numerical data, Primary Health Care/organization & administration, Vulnerable Populations, Epidemiological Monitoring, Essential Public Health Functions, Viral Vaccines/immunology, Coronavirus Infections/diagnosis, Pneumonia, Viral/diagnosis, Coronavirus Infections/immunology, Pneumonia, Viral/immunology, Clinical Study, Masks, Quarantine/organization & administration, Social Isolation, Self Care/instrumentation, China, Breast Feeding/instrumentation, Maternal and Child Health, Kangaroo-Mother Care Method/methods, COVID-19, Ghebreyesus, Tedros Adhanom