Which of the following is the most common disorder of immunity that affects 20% of all individuals in the United States?
A. Atopy
B. Diabetes mellitus
C. Leukemia
D. IgA deficiency
E. Latent tuberculosis infection
ANS: A. Atopy, or allergy, is the most common disorder of immunity and affects 20% of all individuals in the United States. Within this category, allergic rhinitis is perhaps the most common allergic disease and is a consequence of immediate hypersensitivity reactions to common allergens, such as plant pollen or house dust mites, localized to the upper respiratory tract by inhalation. Selective IgA deficiency is the most common known primary immunodeficiency.
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