faecal culture and parasite screen: will identify many organisms. Note that a jejunal biopsy may be required to identify Giardia.
methylene blue staining: will identify numerous WBCs in the faeces. This is suggestive of colonic irritation of an infective or an inflammatory nature.
sigmoidoscopy
specific serological tests: available with Salmonella, Campylobacter, Yersinia and E. histolytica
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