A 7-Month-Old Boy Is Evaluated in the Clinic for Recurrent

question 16

Multiple Choice

A 7-month-old boy is evaluated in the clinic for recurrent bacterial infections.His tonsils are not visible on physical examination.Serum immunoglobulin A (IgA) and IgG levels are markedly decreased,and serum IgM levels are slightly below normal.Based on the findings described,which one of the following should be excluded from the differential diagnosis?

• A)X-linked agammaglobulinemia
• B)X-linked severe combined immunodeficiency disease (X-linked SCID)
• C)Common variable immunodeficiency
• D)X-linked hyper-IgM syndrome
• E)Adenosine deaminase deficiency (ADA)

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Definitions:

Water Temperatures

The measure of how hot or cold water is, which can significantly affect aquatic life and ecosystem health.

Cultural Eutrophication

The process by which a body of water becomes overly enriched with minerals and nutrients due to human activity, leading to excessive algae growth and oxygen depletion.

Nutrient Runoff

The movement of nutrients, typically from fertilizers or natural deposits, from land into water bodies, causing pollution and ecosystem imbalances.

Dredging Lake

The process of removing sediments and debris from the bottom of lakes or water bodies to improve their health or navigability.