CECIL H. FOX / SCIENCE PHOTO LIBRARY. CECIL H. FOX / SCIENCE PHOTO LIBRARY.
Light micrograph of cells from the lungs of a person suffering from AIDS (Acquired Immune Deficiency Syndrome), showing evidence of a usually rare type of pneumonia caused by the protozoan Pneumocystis carinii (seen here as blue spheres). AIDS is caused by a retrovirus designated HIV - Human Immunodeficiency Virus, which destroys T-lymphocytes in the blood that control the body's immune reponse. T-cells control B-cells, which make antibodies that attack invading organisms. Without such protection an AIDS victim may succumb to opportunistic infections, notably pneumonia and Kaposi's sarcoma.
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