Diarrhea

First thing to look: hypotension & othostasis
First thing to treat: IV fluids & antibiotics

Infectious diarrhea
Dx: fecal leukocytes, culture, ova, parasite examination, c. Difficle toxin, Giardia antigen
MC: Campylobacter & Salmonella

Empirical Txt: fluoroquinolones + metronidazole
Scombroid: diphenhydramine
Giardia: metronidazole, tinidazole
Isopora: TMP/SMX
Vibrio vulnificus: Doxycycline
Giardia: paromomycin, raise CD4

C. difficle: DOC: metronidazole. oral vancomycin if metro doesn't work