Ключевые слова: alert, area, attention, bacteria, biohazard, biological, biology, caution, contamination, corona, coronavirus, danger, dangerous, disease, epidemic, flu, forbidden, hazard, hazardous, health, hospital, icon, illustration, infection, influenza, isolated, lab, medical, medicine, mers, protect, protection, restricted, risk, safety, science, security, sign, symbol, toxic, virus, warn, warning, waste, yellow,