Ключевые слова: background, bacteria, bacterium, black, blue, concept, danger, defense, different, disease, epidemic, flat, flu, health, immune, immunity, immunodeficient, immunology, immunotherapy, infection, lay, medical, medicine, ncov, nobody, notebook, object, pandemic, paper, pills, prevent, prevention, protection, quarantine, safety, support, system, table, top, view, virology, virus, white, word, written,