Question : A 20-year-old woman came in with a four-week history of intermittent diarrhoea, bloating, and abdominal discomfort. She had just returned a week ago from a six-month global trip she took during her gap year after finishing school. She had not noticed any blood or mucus in her stool. She did not report any instances of fecal incontinence. She had unintentionally lost 4 kg of weight. The examination did not reveal anything significant. A stool microscopy for ova, cysts, and parasites and a multiplex enteric pathogen molecular panel were carried out. The stool molecular testing failed twice due to the presence of inhibitory factors. What is the most likely pathogen causing her symptoms?