45. A 2-year-old girl has had fever and bloodydiarrhea for 10 days. A stool
culture obtained 7 days ago grew Salmonellaspecies sensitive to amoxicillin.
A blood culture was negative. Despite beginning oral amoxicillin therapy 4
days ago, her diarrhea haspersisted. Current examination shows no other
abnormalities except for atemperature of 38.6 C (101.5 F). Which of the
following is the most likelyexplanation for the failure of amoxicillin to
improve her symptoms?
A) Amoxicillin does not alter th
