Ключевые слова: alphabet, background, bacteria, banner, biology, clinic, concept, defense, disease, doctor, flu, health, healthcare, healthy, hormonal, hormone, idea, illness, immune, immunization, immunology, infect, infection, information, life, medical, medicine, microbes, microbiology, microorganism, object, organism, organisms, passive, physical, prevention, science, sign, symbol, system, text, therapy, time, treatment, vaccination, vaccine, virus, vitamin, wooden, word,