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Which type of immunodeficiency disorder is characterized by a deficiency in immunoglobulin A (Ig

A.

a. Selective IgM deficiency

B.

X-linked agammaglobulinemia

C.

Common variable immunodeficiency (CVID)

D.

Selective IgA deficiency

Answer and Explanation

The Correct Answer is D

Explanation: The correct answer is d. Selective IgA deficiency. This disorder is characterized by a lack of immunoglobulin A, which can lead to an increased susceptibility to infections, particularly in the respiratory and gastrointestinal tracts.

Incorrect choices:

a. Selective IgM deficiency is a rare immunodeficiency disorder characterized by a lack of immunoglobulin M (IgM), not IgA.

b. X-linked agammaglobulinemia is a primary immunodeficiency disorder caused by a mutation in the BTK gene, resulting in a deficiency of B cells and immunoglobulins.

c. Common variable immunodeficiency (CVID) is a heterogeneous group of disorders characterized by decreased levels of immunoglobulins, including IgA, IgG, and IgM.


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Related Questions

Correct Answer is B

Explanation

Explanation: The correct answer is b. Common variable immunodeficiency (CVID). CVID is an example of a primary immunodeficiency disorder, which is typically caused by genetic mutations affecting the immune system's development and function.

Incorrect choices:

a. Human immunodeficiency virus (HIV) infection is an example of a secondary immunodeficiency disorder, which occurs due to an external factor, such as a viral infection, damaging the immune system.

c. Rheumatoid arthritis is an autoimmune disorder that affects the joints and is not classified as an immunodeficiency disorder.

d. Diabetes mellitus is a metabolic disorder involving insulin production and does not directly affect the immune system's function.

Correct Answer is C

Explanation

Explanation: The correct answer is c. Immunodeficiency disorders involve a deficiency in the body's ability to fight infections. These disorders are characterized by a weakened or impaired immune system, leading to an increased susceptibility to infections.

Incorrect choices:

a. Immunodeficiency disorders are not characterized by an overactive immune system. Instead, they are characterized by an underactive or weakened immune system.

b. Immunodeficiency disorders do not result from excessive production of antibodies. Instead, they involve a deficiency in the production or function of immune cells or antibodies.

d. Immunodeficiency disorders primarily affect the immune system, not the nervous system.

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