Answer :
Its probably because parasitic bacteria contaminated her food because she went to the hospital a week after she returned home. Hope this helps.
Answer:
In the given case, a parasitic bacteria would have contaminated her food.
Explanation:
On the basis of the given conditions, a parasitic bacteria would have contaminated Arianne food. The bacteria are airborne pathogens, which possesses the tendency of colonizing the food one consumes. When the food gets contaminated by a pathogenic bacteria it will obtain its nutrition from the body of the host and in return will result in nausea, fever, and diarrhea, thus, affecting the health of the host.