Jacqui Quick, a 21-year-old student, is on a 21-day course of amoxicillin to treat a chest infection. Two days after completion of the course of the antibiotic, she notices an unpleasant taste and white coating on her tongue. Her doctor diagnoses this condition as oral Candida infection (thrush). How might a course of amoxicillin treatment lead to the development of oral thrush?