Ключевые слова: air, background, breath, breathing, chemical, close up, color, concept, contagious, copy space, disease, disposable, epidemic, face mask, fever, filter, flu, heap, heath care, hygiene, ill, illness, incubation, infect, infection, influenza, kn95, mask, medic, medical, mouth, n95, object, outbreak, pandemic, pollution, prevention, protect, protection, protective, respirator, safety, sick, smoke, spread, virus, white,