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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 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

Correct Answer is B

Explanation

Explanation: Passive immunity is acquired when preformed antibodies are transferred to an individual, providing immediate but temporary protection against a specific pathogen. This can occur naturally from a mother to her newborn or artificially through administration of specific antibodies.

Incorrect choices:

a. Active immunity is acquired when the body's immune system is exposed to a pathogen and produces an immune response to provide protection against future infections.

c. Natural immunity refers to immunity that is acquired through natural exposure to a pathogen, either through infection or vaccination.

d. Herd immunity is the indirect protection that occurs when a large percentage of a population becomes immune to a disease, either through vaccination or previous infection, reducing the likelihood of transmission to susceptible individuals.

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