Ключевые слова: allergy, analyzing, background, biohazard, blue, climate change, concept, concern, continent, danger, diagnosis, disease, earth, epidemic, examine, flu, geography, globe, heal, health, hospital, illness, immunity, infection, infectious disease, influenza, map, mask, medicine, pandemic, people, planet, pneumonia, protect, protection, quarantine, risk, science, sickness, stethoscope, symptom, vaccine, virus, world, worldwide,