Ключевые слова: bacteria, bacterium, boost, concept, danger, defense, different, drawing, epidemic, flat, flu, green, health, hygiene, immune, immunity, immunodeficient, immunology, immunotherapy, infection, infectious, lay, medical, medicine, ncov, nobody, object, pandemic, paper, pills, prevent, prevention, protection, safety, sheet, support, system, table, text, top, vaccination, view, virus, white, wooden,