Ключевые слова: alert, america, attention, backgrounds, barrier, biohazard, caution, closed, coronavirus, covid19, danger, do not cross, element, emergency, epidemic, hand, health, home, human, infection, information, inscription, isolated, keep, male, man, medical, medicine, no entry, oreforms, pandemic, person, placard, professional union, protest, quarantine, reductions, separate, sign, siren, stay, stay home, stop, symbol, tape, vaccine, virus, warning, yellow, zone,