Question 1

Which of the following best describes the principle of herd immunity?

Accepted Answer

Immunity in most of the population reduces the likelihood of disease outbreaks by limiting the number of susceptible individuals.

Question 2

Which of the following is a key difference between attenuated (live) and inactivated (killed) vaccines?

Accepted Answer

Attenuated vaccines use pathogens with reduced virulence, while inactivated vaccines use killed pathogens.

Question 3

A patient with a severe egg allergy should avoid which type of vaccine?

Accepted Answer

Vaccines produced using viruses cultured in chicken eggs.

Question 4

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

Accepted Answer

Inactivated vaccines often require multiple doses to achieve full immunity because they do not replicate in the host.

Question 5

Which of the following is an example of a toxoid vaccine?

Accepted Answer

Tetanus vaccine

Question 6

A new vaccine is developed using recombinant DNA technology to express a viral antigen in yeast cells. Which type of vaccine is this?

Accepted Answer

Subunit vaccine

Question 7

Which of the following statements about passive immunotherapy is correct?

Accepted Answer

It provides immediate protection but does not result in long-term immunity.

Question 8

Which of the following is a potential risk associated with attenuated vaccines?

Accepted Answer

Modified microbes may retain enough residual virulence to cause disease in susceptible individuals.

Question 9

Why is it important to continue vaccinating children against diseases like measles, even when there are few cases in the population?

Accepted Answer

To maintain herd immunity and prevent outbreaks by reducing the number of susceptible individuals.

Question 10

Which of the following best describes the function of an adjuvant in a vaccine?

Accepted Answer

A chemical added to increase the effective antigenicity of the vaccine.

Question 11

A patient receives an injection of antiserum after exposure to rabies. Which type of immunity is this?

Accepted Answer

Passive immunotherapy

Question 12

Which of the following is a limitation of passive immunotherapy?

Accepted Answer

The antibodies are degraded quickly and do not provide long-term protection.

Question 13

Which of the following equations best represents the relationship between the number of susceptible individuals ($$S$$), the total population ($$N$$), and the threshold for herd immunity ($$H$$)?

Accepted Answer

$$H = 1 - \frac{1}{R_0$}$$

Question 14

Which of the following is NOT a reason why vaccine development can be challenging for some pathogens?

Accepted Answer

All pathogens can be easily cultured in the laboratory.

Question 15

Which of the following best describes the process of attenuation?

Accepted Answer

Reducing the virulence of a pathogen for use in a vaccine.

Question 16

A vaccine is created by chemically modifying a bacterial toxin so that it is no longer toxic but still immunogenic. What type of vaccine is this?

Accepted Answer

Toxoid vaccine

Question 17

Which of the following statements about combination vaccines is correct?

Accepted Answer

They allow for the simultaneous administration of antigens from several pathogens.

Question 18

Which of the following is a benefit of using recombinant DNA technology in vaccine development?

Accepted Answer

It can make vaccines more effective, cheaper, and safer.

Question 19

Which of the following best explains why passive immunotherapy does not protect against subsequent infections?

Accepted Answer

It does not stimulate the formation of memory cells.

Question 20

A new vaccine is delivered using a nanopatch that does not require refrigeration and targets skin cells rich in antigen-presenting cells (APCs). What is a major advantage of this technology?

Accepted Answer

It increases vaccine accessibility and effectiveness, especially in resource-limited settings.

Immunization and Immune Testing: Principles, Types, and Applications

Study Guide - Practice Questions

Study Guide - Flashcards