AIDS patients in San Francisco General Hospital. Nurse untangles air tank lines and talks to patient, who is sitting up on bed. Patient stands up and walks unsteadily as nurse follows with air tank. Profile of patient in bed. Patient breathes heavily and listens to radio. Nurse talks with and walks patient down hallway, supporting him with her arm and carrying his IV bags. Patient is thin and uses a walker. Their feet walking. Sign that reads “MICROBIOLOGY / SEROLOGY;” another sign that says “BIOHAZARD” on the door beneath this sign. Male technician looks through petri dish samples at a desk. Two technicians look at samples through microscopes. Red and white substance in petri dish. Technicians looks at this substance.