Ключевые слова: 19, america, american, background, blood, care, color, contagious, control, copy, corona, coronavirus, covid, covid19, danger, dangerous, disease, epidemic, flag, flat, health, infection, infectious, lay, national, nobody, object, outbreak, pandemic, prevent, quarantine, risk, safety, samples, space, states, test, text, top, tubes, united, usa, view, viral, virus,