Ключевые слова: area, attention, bacteria, biochemical, biohazard, biologic, biological, biology, caution, chemical, contagious, danger, dangerous, disease, environment, epidemic, experiment, flu, forbidden, gas, hazard, hazardous, icon, illustration, isolated, lab, laboratory, lethal, material, medical, medicine, poison, protect, protection, research, risk, science, scientific, security, sign, substance, symbol, toxic, viral, virus, warning, waste, weapon, zone,