opportunistic infection - any infection caused by a microorganism that does not normally cause disease in humans; occurs in persons with abnormally functioning immune systems (as AIDS patients or transplant patients receiving immunosuppressive drugs)
Why your 'flushing' could be a red alert to see your doctor. It is a normal body response that may occur when we are embarrassed, angry, excited, or experiencing other strong emotions. But 'flushing' - when the face, ears, neck and, occasionally, upper chest, take on a red colour, accompanied by a hot feeling - can also be a sign of a more serious underlying condition.
chagrin, humiliation, mortification(verb) strong feelings of embarrassment. humiliate, mortify, chagrin, humble, abase(verb) cause to feel shame; hurt the pride of. He humiliated his colleague by criticising him in front of the boss.