Ключевые слова: bacteria, bacterium, concept, cubes, danger, defense, epidemic, flat, flu, glove, health, hygiene, immune, immunity, immunodeficient, immunology, immunotherapy, infection, infectious, items, lay, medical, medicine, ncov, nobody, object, pandemic, prevent, prevention, protection, safety, support, system, table, top, vaccination, view, virus, white, wooden, word,