Ключевые слова: adult, allergy, background, bad, care, caucasian, chills, city, clothes, cold, disease, fever, flu, freeze, hat, health, healthcare, ill, illness, immunity, infection, influenza, jacket, male, man, outdoors, patient, person, pneumonia, problem, season, seasonal, sick, sickness, street, suffering, symptom, symptoms, tissue, unwell, virus, warm, weather, winter, young,