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Why are booster doses of some vaccines recommended?

A.

To increase the number of antibodies in the blood

B.

To decrease the risk of an adverse reaction to the vaccine

C.

To provide immunity for a longer duration

D.

To reduce the number of required vaccine doses

Answer and Explanation

The Correct Answer is C

Explanation: Booster doses of vaccines are recommended to reinforce and extend the duration of immunity provided by the initial vaccination. They help the immune system to maintain a higher level of protection against the disease over time.

Incorrect choices:

a. The number of antibodies in the blood is not increased by booster doses; rather, the immune system's memory is reinforced.

b. Booster doses do not decrease the risk of adverse reactions; they are given to maintain immunity.

d. Booster doses do not reduce the number of required vaccine doses; they are additional doses given to maintain immunity over time.


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Related Questions

Correct Answer is D

Explanation

Explanation: Recognizing and responding to specific antigens. T cells are a type of lymphocyte that plays a central role in cell-mediated immunity. They recognize and respond to specific antigens presented by infected or abnormal cells, leading to their destruction.

Incorrect choices:

a. T cells are not responsible for the production of antibodies, but that is the role of B cells in the humoral immune response.

b. While T cells are involved in directly attacking and destroying infected cells, their main function is to recognize specific antigens rather than directly attacking pathogens.

c. Marking pathogens for destruction by phagocytes is primarily a function of antibodies and complement proteins, not T cells.

Correct Answer is C

Explanation

Explanation: The human papillomavirus (HPV) vaccine is recommended for adolescents to protect against certain types of HPV infections, which can lead to cervical, vaginal, vulvar, penile, anal, and throat cancers.

Incorrect choices:

a. The hepatitis B vaccine is typically given in infancy and does not protect against certain types of cancer.

b. The influenza vaccine is recommended annually for people of all ages to prevent the flu, not certain types of cancer.

d. The meningococcal vaccine protects against meningococcal infections, not certain types of cancer.

Conclusion xx

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