Acute diarrhea in immunocompromised

What specific unique etiologic factors exist for acute diarrheal illness in immunocompromised hosts? 

Immunoglobulin A deficiency, human immunodeficiency virus (HIV) and acquired immune deficiency syndrome, organ transplantation, rheumatologic disease on immune-suppressing agents, and chemotherapy all may predispose individuals to enteric infection. These hosts are susceptible to common causes of acute diarrhea but also to agents not commonly problematic for normal hosts: Mycobacteria, Cyclospora, Isospora Cryptosporidium , cytomegalovirus (CMV), and herpes.

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