05-12-2009, 10:42 PM
A 60-year-old alcoholic male with a long history of cigarette smoking is brought to the emergency department
after being found behind the neighborhood bar at 4 AM in freezing weather. On arrival, he is lethargic and
experiences a shaking chill. His heart rate is 106, his breathing is labored with diffuse rales, and his temperature
is 102.5 degrees Fahrenheit. His sputum is blood tinged, containing numerous gram-positive cocci which are
identified as Streptococcus pneumoniae. The man is treated with penicillin and his condition improves over the
next few days. Which of the following immune effector mechanisms was most important in completely clearing this
infection?
A. ADCC (Antibody dependent cell cytotoxicity)
B. Complement mediated opsonization
C. Cytotoxic T cell lymphocytes
D. LAK cells
E. Natural killer cells
after being found behind the neighborhood bar at 4 AM in freezing weather. On arrival, he is lethargic and
experiences a shaking chill. His heart rate is 106, his breathing is labored with diffuse rales, and his temperature
is 102.5 degrees Fahrenheit. His sputum is blood tinged, containing numerous gram-positive cocci which are
identified as Streptococcus pneumoniae. The man is treated with penicillin and his condition improves over the
next few days. Which of the following immune effector mechanisms was most important in completely clearing this
infection?
A. ADCC (Antibody dependent cell cytotoxicity)
B. Complement mediated opsonization
C. Cytotoxic T cell lymphocytes
D. LAK cells
E. Natural killer cells