A 9-Month-Old Infant Is Seen by a Physician Because of a Persistent

Multiple Choice

A 9-month-old infant is seen by a physician because of a persistent skin infection.His white and red blood cell counts are normal.However,immunofixation electrophoresis indicates a low level of IgG.When the infant returns to the physician for a follow-up visit in a month,his IgG level has increased.What condition do these results indicate?

A) Severe combined immunodeficiency
B) Transient hypogammaglobulinemia
C) Common variable immunodeficiency
D) DiGeorge anomaly