Which of the following is not the cause of a natural immunodeficiency?
a. A recessive gene resulting in lack of a thymus gland
b. A recessive gene resulting in few B cells
c. HIV infection
d. Immunosuppressant drugs
e. All of the above are causes of natural immunodeficiency

검증된 단계별 안내

Step 1: Understand the definition of natural immunodeficiency. Natural immunodeficiency refers to immune system defects that are present from birth, often due to genetic causes or congenital conditions.

Step 2: Analyze each option to determine if it represents a natural (congenital/genetic) cause or an acquired cause of immunodeficiency.

Step 3: Option (a) describes a recessive gene causing lack of a thymus gland, which is a congenital defect leading to immunodeficiency (natural cause).

Step 4: Option (b) describes a recessive gene causing few B cells, another genetic defect resulting in natural immunodeficiency.

Step 5: Option (c) HIV infection and option (d) immunosuppressant drugs are acquired causes of immunodeficiency, not natural. Therefore, these are not natural immunodeficiencies.

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주요 개념

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Natural vs. Acquired Immunodeficiency

Natural immunodeficiency refers to immune system defects present from birth, often due to genetic causes affecting immune cell development. Acquired immunodeficiency develops later in life due to external factors like infections or drugs. Understanding this distinction helps identify which causes are innate versus acquired.

Genetic Causes of Immunodeficiency

Certain recessive genes can lead to congenital immunodeficiencies by impairing the development or function of immune organs or cells, such as the thymus gland or B cells. These genetic defects result in a reduced ability to mount immune responses from birth.

Impact of HIV Infection and Immunosuppressant Drugs

HIV infection and immunosuppressant drugs cause acquired immunodeficiency by damaging or suppressing immune cells after birth. HIV targets T cells, while immunosuppressants reduce immune activity to prevent rejection or treat autoimmune diseases, both leading to weakened immunity.

Which of the following is not the cause of a natural immunodeficiency?a. A recessive gene resulting in lack of a thymus glandb. A recessive gene resulting in few B cellsc. HIV infectiond. Immunosuppressant drugse. All of the above are causes of natural immunodeficiency