Ключевые слова: activity, alert, attention, background, biohazard, biological, calm, caution, coronavirus, covid, danger, dirty, disease, epidemic, flag, flu, grunge, hazard, health, home, icon, infected, infection, inspection, keep, medical, novel, pandemic, pneumonia, protection, quarantine, respiratory, safety, security, sickness, sign, stop, symbol, toxic, vaccine, virus, warfare, warning, world, zone,