01-14-2011, 08:50 PM
An asymptomatic 32-year-old man comes for a routine health maintenance examination. He has a 10-year history of frequent sinus and pulmonary infections. He had an anaphylactic reaction to a blood transfusion following a motor vehicle collision 3 years ago. His temperature is 37 C (98.6 F). Examination shows mild erythema in the posterior pharynx. The lungs are clear to auscultation. A complete blood count and serum protein electrophoresis are within normal limits. Which of the following is the most likely cause of the frequent infections?
A ) Colonization with Streptococcus pneumoniae
B ) Common variable immunodeficiency
C ) HIV infection
D ) Selective IgA deficiency
E ) X-linked agammaglobulinemia
A ) Colonization with Streptococcus pneumoniae
B ) Common variable immunodeficiency
C ) HIV infection
D ) Selective IgA deficiency
E ) X-linked agammaglobulinemia