the most important opportunistic pathogens are candida albicans ( stomatitis and esophagitis ) , cytomegalovirus and herpes simplex virus ( esophagus , stomach , biliary system , colon ) , cryptosporidium ( small intestine , biliary system ) , isospora belli ( small intestine ) , salmonella , shigella , and campylobacter ( small and large intestine , septicemia ) , and mycobacterium avium intracellulare ( liver , spleen , intestinal submucosa , and bacteremia ) .
C0014868
esophagitis
C0014876
esophagus