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
References
American Medical Association, American Nurses Association/American Nurses Foundation, Centers for Disease Control and Prevention, et al. Diagnosis and management of foodborne illnesses: a primer for physicians and other health care professionals. MMWR Recomm Rep. 2004 Apr 16;53(RR-4):1-33.
Shane AL, Mody RK, Crump JA, et al. 2017 Infectious Diseases Society of America clinical practice guidelines for the diagnosis and management of infectious diarrhea. Clin Infect Dis. 2017 Nov 29;65(12):e45-80.
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