Ключевые слова: 4th, alert, america, american, background, concept, confine, control, corona, coronavirus, covid19, day, disease, earth, emergency, epidemic, flag, flu, global, health, immunity, incubation, independence, infected, infection, inscription, july, map, mask, medical, novel, outbreak, pandemic, panoramic, patient, pneumonitis, pollution, prevention, protection, quarantine, safety, sign, social, symptoms, treatment, vaccine, virus, vote, warning, wide, world,