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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 D

Explanation

Explanation: The correct answer is d. Maintain strict hand hygiene and utilize protective equipment when providing care. Children with severe combined immunodeficiency (SCID) have a severely compromised immune system, making them highly susceptible to infections. Strict hand hygiene and the use of protective equipment, such as gloves and masks, are essential in preventing the transmission of infections to the child.

Incorrect choices:

a. Placing the child on contact precautions may not be sufficient to protect them from infections due to their high susceptibility. Additional precautions, such as strict hand hygiene and protective equipment, should be implemented.

b. Encouraging the child to play with other children may increase the risk of exposure to infections. Children with SCID should be protected from contact with potential sources of infection.

c. Live attenuated vaccines are contraindicated for children with SCID, as they can cause severe infections. Only inactivated vaccines are recommended to avoid the risk of vaccine-associated infections.

Correct Answer is B

Explanation

Explanation: The correct answer is b. X-linked agammaglobulinemia. X-linked agammaglobulinemia is a primary immunodeficiency disorder caused by a genetic mutation that leads to the absence of mature B cells, resulting in an inability to produce antibodies (immunoglobulins). As a result, individuals with this disorder are highly susceptible to infections, especially bacterial infections.

Incorrect choices:

a. DiGeorge syndrome is a primary immunodeficiency disorder characterized by abnormalities in the development of certain organs, including the thymus, leading to impaired T cell function.

c. Severe combined immunodeficiency (SCID) is a group of rare genetic disorders that affect both T cells and B cells, resulting in a severe impairment of the immune system.

d. Acquired immunodeficiency syndrome (AIDS) is a secondary immunodeficiency disorder caused by the human immunodeficiency virus (HIV) infection, which specifically targets and destroys CD4+ T cells, weakening the immune system's ability to fight infections.

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