Arianne recently traveled abroad where she enjoyed eating food from different countries and learning about different cultures. A week after she returned home, she checked into the hospital with signs of nausea, fever, and diarrhea. What best explains what happened to Arianne?

Nausea, fever, and diarrhea after traveling are signs of a foodborne infection. A parasite or harmful bacterium in contaminated food can cause these symptoms. Mutualistic and commensal organisms generally live with a host without causing illness, and the choices about predation do not best explain her symptoms.

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