Answer:
She got infected through the water she drank at the stream.
Explanation:
Protozoa is a type of pathogenic microorganisms.
Giardia are flagellate protozoa that cause the disease called giardiasis. The parasites enters the body through ingestion of contaminated food or water The food or water are usually contaminated by the feces of infected people or animals.
The protozoa attach to the lining of the host’s small intestine, where they prevent the host from fully absorbing nutrients. They may also cause diarrhea, abdominal pain, and fever.
The symptoms in the question above points to a likelihood that Terri’s sickness was caused by a Giardia protozoa.