A Fredericton teenager’s condition has improved after a week-long bout with E. coli O157:H7.

The Daily Gleaner reports Micaella Boer, 18, first showed symptoms of the infection Sunday, complaining of stomach cramps and an irritable bowel. Her mother and one of her sisters had recently fought a flu bug, so the family waited for the illness to pass. However, when her father Scott Boer returned from work at 4 a.m. on Wednesday morning to find his daughter in pain with blood in her stool, it was time to see a doctor.

She was admitted to the Dr. Everett Chalmers Regional Hospital on Wednesday as a precautionary measure due to severe dehydration. Test results later revealed a positive test for Escherichia coli O157:H7.

Once admitted, the Boers heard of another E. coli case in the hospital. However, there’s no confirmation on whether the two were linked, and Public Health has begun its investigation.