Ключевые слова: artificial, background, bacteria, bacterium, clipboard, concept, danger, defense, drawing, epidemic, flat, flu, health, hygiene, immune, immunity, immunodeficient, immunology, immunotherapy, infection, infectious, lay, medical, medicine, ncov, nobody, object, pandemic, phrase, plant, prevent, prevention, protection, safety, stethoscope, support, system, table, top, vaccination, view, virus, white, wooden,