Consider routine pathogens causing Diarrhea
Viruses (Norovirus, Rotavirus, Adenovirus, Astrovirus, etc.)
Bacteria (Salmonella, Campylobacter, Shigella, Enterotoxigenic E. coli, C. diff, etc.)
Protozoa (Cryptosporidium, Giardia, Cyclospora, Entamoeba, etc.)
Side effect of nelfinavir and ritonavir
Kaposi sarcoma
Cryptosporidium parvum (brief course of illness) - severe watery diarrhea
C. diff if antibiotic exposed
Viruses (Norovirus, Rotavirus, Adenovirus, Astrovirus, etc.)
Bacteria (Salmonella, Campylobacter, Shigella, Enterotoxigenic E. coli, C. diff, etc.)
Protozoa (Cryptosporidium, Giardia, Cyclospora, Entamoeba, etc.)
Microsporidium
Cryptosporidium
Histoplasma
Lymphoma
Enteroaggregative Escherichia coli (EAEC) (can also affect immunocompetent children)<unk>  can directly infiltrate bowel wall leading to diarrhea
Cryptosporidium parvum (chronic course of illness)
M. tuberculosis (disseminated disease increasingly likely <100)
Cryptococcus
Isospora
Mycobacterium avium complex (MAC) - infiltration of bowel associated with malabsorption
CMV<unk>  neurologic complications
Toxoplasmosis
Cryptococcosis
AIDS Dementia
Seizures in patients with<unk> -AIDS
Primary CNS lymphoma<unk>  pulmonary complications
Pneumocystis jirovecii pneumonia (PCP)
Tuberculosis (TB)
CMV pneumonia
Ophthalmologic complications
CMV Retinitis
Herpes Zoster Ophthalmicus
Other
AIDS fever of unknown origin
Immune reconstitution inflammatory syndrome<unk> 
Kaposi's sarcoma
Pruritic papular eruption of<unk> 
Hairy oral leukoplakia
HAART medication side effects
HAART-induced lactic acidosis
Neuropyschiatric effects
Hepatic toxicity
Renal toxicity
Steven-Johnson's
Cytopenias
GI symptoms
Endocrine abnormalities
Toxoplasmosis
Cryptococcosis
AIDS Dementia
Seizures in patients with<unk> -AIDS
Primary CNS lymphoma
Pneumocystis jirovecii pneumonia (PCP)
Tuberculosis (TB)
CMV pneumonia
CMV Retinitis
Herpes Zoster Ophthalmicus
AIDS fever of unknown origin
Immune reconstitution inflammatory syndrome<unk> 
Kaposi's sarcoma
Pruritic papular eruption of<unk> 
Hairy oral leukoplakia
HAART-induced lactic acidosis
Neuropyschiatric effects
Hepatic toxicity
Renal toxicity
Steven-Johnson's
Cytopenias
GI symptoms
Endocrine abnormalities
HIV diarrhea
Consider routine pathogens causing Diarrhea
CMV colitis
Viruses 
Traveler's diarrhea
Bacteria 
Acute gastroenteritis 
Protozoa 