Mary is so worn down studying microbiology all of the time that she ended up with strep throat. The doctor prescribes some antibiotics to treat her infection. How will the antibiotics affect her normal flora? After the course of the antibiotics are complete her strep throat is gone, but now Mary is suffering from a yeast infection. What went wrong? A fellow microbiology student suggests that she start eating some yogurt. Why would they say that? Mary goes home for the weekend to visit her parents and her dad says that he was prescribed a proton pump inhibitor for his heartburn issues. Mary says he needs to take care to with food preparation and cooking as he could be at greater risk now for stomach and intestinal infections. He asks why? What will Mary tell her dad about his situation.