Ключевые слова: bacteria, breath, care, clinic, control, cough, danger, disease, doctor, epidemic, equipment, face, filter, flu, health, healthcare, hospital, human, hygiene, illness, individual, infection, influenza, isolated, mask, medic, medical, medicine, mouth, pandemic, pollution, prevention, professional, protect, protection, protective, quarantine, respiratory, sars, surgeon, surgery, surgical, swine, virus,