The Washington Manual of Medical Therapeutics helps you diagnose and treat hundreds of medical conditions. Consult clinical recommendations from a resource that has been trusted on the wards for 50+ years. Explore these free sample topics:
-- The first section of this topic is shown below --
- Diarrhea lasting >30 days is defined as chronic.
- Infectious causes are usually parasitic, including Cryptosporidium (see Chapter 16: Sexually Transmitted Infections, Human Immunodeficiency Virus, and Acquired Immunodeficiency Syndrome section on Opportunistic Infections in HIV), Giardia, and Entameba.
- Giardiasis is diagnosed by stool antigen testing or microscopic examination. Treatment is metronidazole 500 mg PO q12h for 7 days and tinidazole 2 g PO single dose or nitazoxanide 500 mg PO q12h for 3 days.
- Amebiasis is diagnosed by stool microscopy, antigen testing and serology. Treatment is metronidazole 500 mg q8h for 7–10 days, followed by iodoquin or paromomycin to eradicate cysts.