<prompt> The most common oppounistic infection observed in patients with AIDS is -Atypical mycobacteriaHaemophilus influenzaePseudomonas aerugiosaPneumocystis carinii  <response>: The symptoms of PCP include Fever Cough Difficulty breathing Chest pain Chills Fatigue tiredness In people with HIVAIDS, PCP symptoms usually develop over several weeks and include a mild fever. In people who have weakened immune systems for reasons other than HIVAIDS, PCP symptoms usually develop over a few days, often with a high fever. Ref Harrison20th edition pg 1078 