Ключевые слова: adult, bacteria, blow, blowing, cold, cough, face, fever, flu, grippe, hand, handkerchief, handsome, health, healthcare, holding, home, illness, indoors, infection, influenza, lifestyle, man, medical, medicine, nose, one person, patient, person, problem, retired, retiree, senior, senior citizen, sick, sitting, sneeze, suffer, symptom, treatment, virus,