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A 54-year-old man complains of intermittent fever, weight loss, arthralgia and diarrhea over several months.
Jejunal biopsy reveals flattened mucosa containing periodic acid-Schiff (PAS) positive macrophages.
What is the most likely diagnosis?
35 years old teacher attends clinic for memory problems. The only other symptom is intermittent diarrhoea over the previous 3 months.
He has limited vertical eye movements and exhibits rhythmic simultaneous eye and mouth movements.
Which pathogen is most likely to be the cause of his symptoms?