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A newborn infant has immunity from their mother. Which type of immunity is it?

A.

Naturally acquired active immunity

B.

Artificially acquired passive immunity

C.

Naturally acquired passive immunity

D.

Artificially acquired active immunity

Answer and Explanation

The Correct Answer is C

A. Naturally acquired active immunity

  This results from infection and the body’s own immune response—not applicable to newborns.

B. Artificially acquired passive immunity

  This comes from injection of antibodies (e.g., immunoglobulins)—not from the mother.

C. Naturally acquired passive immunity

    This is passed from mother to child through the placenta (IgG antibodies) and via breast milk (IgA).

D. Artificially acquired active immunity

  This comes from vaccines that stimulate the body to produce its own antibodies.


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Related Questions

Correct Answer is D

Explanation

A. Infections:

Infections in older adults are often due to immune suppression, not directly from autoantibodies.

B. Cancer:

While aging does increase cancer risk, autoantibodies do not directly cause cancer.

C. Allergic reaction:

Allergies involve hypersensitivity reactions to external antigens, not the body's own cells.

D. Autoimmune disease:

Autoantibodies target the body's own tissues, leading to autoimmune diseases such as rheumatoid arthritis or lupus, which are more common in older adults.

Correct Answer is D

Explanation

A. Allergic reaction:

Allergic reactions are typically associated with overactive immune responses, not decreased T and B cell function.

B. Increase in antibodies:

Antibody production actually declines with age due to reduced B cell function.

C. Cancer:

Decreased immune surveillance can contribute to cancer risk, but the most direct consequence of T and B cell decline is susceptibility to infections.

D. Infections:

Reduced activity of T and B cells impairs the immune response, making older adults more prone to infections.

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