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