#january2020mccqe1
A pediatrician becomes concerned after learning the family and medical history of an infant who is currently suffering from pneumonia, with a presumed diagnosis of Streptococcus pneumoniae infection. Over the past year, the patient has suffered from erysipelas as well as a previous bout of pneumococcal pneumonia; both were treated successfully with antibiotics. The patient’s mother says that her son’s maternal uncle also suffered from repeated bacterial infections and was successfully treated with antibiotics. On physical examination, it appears that the patient does not have tonsils. His mother denies a previous tonsillectomy. Analysis of the boy’s serum would most likely yield which of the following results?
(A) Absence of T lymphocytes
(B) <200 CD4+ T lymphocytes/mm3
(C) IgA, IgG, and IgM levels normal
(D) IgG and IgM levels markedly decreased, no IgA
(E) IgG and IgM levels normal, IgA markedly decreased
A pediatrician becomes concerned after learning the family and medical history of an infant who is currently suffering from pneumonia, with a presumed diagnosis of Streptococcus pneumoniae infection. Over the past year, the patient has suffered from erysipelas as well as a previous bout of pneumococcal pneumonia; both were treated successfully with antibiotics. The patient’s mother says that her son’s maternal uncle also suffered from repeated bacterial infections and was successfully treated with antibiotics. On physical examination, it appears that the patient does not have tonsils. His mother denies a previous tonsillectomy. Analysis of the boy’s serum would most likely yield which of the following results?
(A) Absence of T lymphocytes
(B) <200 CD4+ T lymphocytes/mm3
(C) IgA, IgG, and IgM levels normal
(D) IgG and IgM levels markedly decreased, no IgA
(E) IgG and IgM levels normal, IgA markedly decreased
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