Ключевые слова: adult, air, antiviral, bacteria, beautiful, care, covered, crowd, disease, epidemic, face, filter, flu, h1n1, h7n9, health, healthcare, hog, human, ill, illness, infected, infection, influence, influenza, mask, medical, medicine, outbreak, pandemic, patient, people, person, pig, pollution, prevention, protect, protection, protective, safe, safety, sars, sick, street, surgery, swine, symptom, virus, white, young,