1. AIDS
... to the scene. B lymphocytes, or B cells, serve as the body's antibody factories. Each antibody is targeted to recognize and bind to an antigen from a specific invader. When antibodies circulating through blood and body fluids encounter this invader, they mark it for destruction. T lymphocytes, or T cells, are part of the cellular immune response. Some T cells, like CD4+ T cells (also called "helper" ... and men is a lung infection called Pneumocystis carinii pneumonia , abbreviated PCP. Other AIDS-defining conditions include severe body wasting and Candida infection of the esophagus, w...
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