Ключевые слова: airways, allergy, avoid, breathing, chronic, cold, cough, disease, dry, expulsion, feeling, fever, flu, fluids, foreign, health, ill, illness, infection, influenza, irritants, lungs, mask, medical, medicine, microbes, mucus, particles, passage, persistent, pollution, prevention, protective, rapid, reflex, release, safety, seasonal, sickness, sneeze, treatment, unwell, virus, wet,