Question 1

Which of the following best describes the difference between active and passive immunization?

Accepted Answer

Active immunization involves the administration of antigens to induce an adaptive immune response, while passive immunization involves the transfer of pre-formed antibodies.

Question 2

Which of the following is NOT a feature of an effective vaccine?

Accepted Answer

It must cause a mild form of the disease to ensure immunity.

Question 3

A patient receives a vaccine containing inactivated toxins from Clostridium tetani. What type of vaccine is this?

Accepted Answer

Toxoid vaccine

Question 4

Which of the following best explains why conjugate vaccines are used for infants against encapsulated bacteria?

Accepted Answer

Infants do not generate sufficient immune responses to carbohydrate antigens, so the carbohydrate is conjugated to a protein to enhance the response.

Question 5

Which of the following is a major risk associated with live, attenuated vaccines?

Accepted Answer

The attenuated pathogen can revert to a virulent form in immunocompromised individuals.

Question 6

Which of the following best describes the mechanism of DNA vaccines?

Accepted Answer

Plasmid DNA encoding pathogen antigens is expressed in antigen-presenting cells, which present the antigen to lymphocytes.

Question 7

Which of the following is an example of passive, naturally acquired immunity?

Accepted Answer

Transfer of maternal antibodies to an infant via breast milk.

Question 8

Why are adjuvants added to some vaccines?

Accepted Answer

To enhance the immune response to the vaccine antigen.

Question 9

Which of the following vaccines is an example of a subunit vaccine?

Accepted Answer

Hepatitis B vaccine

Question 10

A new influenza vaccine is produced by growing the virus in fertilized chick embryos and then inactivating it with chemicals. What type of vaccine is this?

Accepted Answer

Inactivated/killed vaccine

Question 11

Which of the following best explains why booster shots are often required for toxoid vaccines?

Accepted Answer

Antibody levels and affinity increase with multiple exposures to the same antigen.

Question 12

Which of the following is a practical consideration for an effective vaccine?

Accepted Answer

Low cost per dose and ease of administration.

Question 13

Which of the following best describes the purpose of vaccination?

Accepted Answer

To generate a protective immune response against an organism that can cause severe illness, disability, or death.

Question 14

Which of the following is a potential consequence of decreased vaccine coverage in a population?

Accepted Answer

Resurgence of infectious diseases.

Question 15

Which of the following best explains why live, attenuated vaccines generally induce stronger cellular immune responses than inactivated vaccines?

Accepted Answer

Live, attenuated vaccines replicate in the host, stimulating both antibody and T cell responses.

Question 16

Which of the following is an example of artificially acquired, passive immunity?

Accepted Answer

Injection of preformed antibodies after exposure to a toxin.

Question 17

Which of the following is a key characteristic of adaptive immunity?

Accepted Answer

Immunological memory allows for more rapid and vigorous responses to the same antigen in the future.

Question 18

Which of the following best describes the role of adjuvants in vaccines?

Accepted Answer

They non-specifically activate the immune system to enhance the response to the vaccine antigen.

Question 19

Which of the following is a reason why DNA vaccines are considered safe?

Accepted Answer

They do not contain live pathogens and cannot revert to a virulent form.

Question 20

Which of the following best explains why neutralizing antibodies are important for some vaccines?

Accepted Answer

They prevent infection of cells that cannot be replaced, such as neurons.

Vaccination and Immunization: Principles, Types, and Applications

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