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Health New words: Infections (adj): easily transferred from one person to another 传染 Prevalent (adj): very common; dominant 流行的,盛行的 Diarrhea (n): the condition of having excessive and frequent bowel movements 腹泻 Unpasteurized (adj): not purified through boiling 没有消毒的 Infant (n): a baby; a child at an age before he or she develops the ability to walk 婴儿 What is the talk mainly about? A. The history of different diseases. B. The worst kind of infectious disease. C. Information on infectious disease. D. The number of babies with infectious disease.