Chronic Diarrhea
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- 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.
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- 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.
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