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Changes in Alveolar Macrophage Number are Early Events in Pneumocystis carinii Infection

Pnewnocystis carinii (P. carinii) remains a major cause of pneumonia in patients with AIDS as well as other immunocompromised patients [3,.5]. Alveolar macrophages are important for the clearance of P. corinii. Previous reports state that alveolar macrophage number in bchoalveolar lavage (BAL) fluid, relative to other cell types, decreases during P. carinii pneumonia in immunosuppressed individuals [2.4,6]. Alveolar macrophages in immunosuppressed humans and animals are exposed to an altered immune environment, affecting their response to infectious agents. This study sought to quantify the changes in alveolar macrophage number in BAL fluid during infection and compare them to the changes in immunosuppressed animals that were not infected with P. curinii.