Ключевые слова: background, blue, breath, breathing, care, clean, concept, cough, danger, defense, design, disease, epidemic, equipment, face mask, filter, flu, health, health care, healthy, ill, infection, influenza, isolated, mask, medical, medical mask isolated, medicine, object, pneumonia, pollution, protect, protection, protective, protector, respirator, respiratory, safety, science, sick, sickness, style, surgical, symbol, transparent, virus, white,