the hiv-induced damage of the mucosa-associated immune system ( reduction of cd4-positive cells in the lamina propria ) leads to an increased risk of opportunistic infections ( candida , herpes simplex virus , cytomegalovirus , cryptosporidia , isospora belli , strongyloides stercoralis , mycobacteria ) and the development of malignant tumors ( kaposi 's sarcoma , malignant lymphoma ) .
C0006826
malignant tumors
C0024299
malignant lymphoma