Question 1

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

Accepted Answer

Active immunization requires the administration of antigens to stimulate an adaptive immune response, whereas passive immunotherapy provides immediate protection by transferring preformed antibodies.

Question 2

Edward Jenner is credited with the discovery of vaccination. Which pathogen was his first vaccine designed to protect against?

Accepted Answer

Smallpox virus

Question 3

Attenuated vaccines are produced by reducing the virulence of a pathogen. Which of the following is a potential risk associated with attenuated vaccines?

Accepted Answer

They may cause mild infections and provide contact immunity, but can retain enough residual virulence to cause disease in susceptible individuals.

Question 4

Which vaccine type is most likely to require multiple doses due to possessing few antigenic determinants?

Accepted Answer

Toxoid vaccine

Question 5

A patient with an egg allergy should avoid certain vaccines. Why is this necessary?

Accepted Answer

Some vaccines are manufactured by culturing viruses inside chicken eggs, which may contain egg proteins.

Question 6

Which of the following best explains why parents should vaccinate their children even when the incidence of diseases like measles is very low?

Accepted Answer

Vaccination maintains herd immunity, preventing outbreaks if the disease is reintroduced.

Question 7

Which serological test is most appropriate for quantifying the amount of antibody in a serum sample?

Accepted Answer

Agglutination titration

Question 8

In a precipitation reaction, what is the result when antigen and antibody are mixed in optimal proportions?

Accepted Answer

Large immune complexes (precipitates) form.

Question 9

Which serological test uses fluorescently labeled antibodies to detect the presence of antigens or antibodies?

Accepted Answer

Fluorescent immunoassay

Question 10

A newborn tests positive for HIV antibodies using ELISA, but six months later the test is negative. What is the most likely explanation?

Accepted Answer

The initial antibodies were maternal and degraded over time; the child was not infected.

Question 11

Which of the following is a major advantage of ELISA (enzyme-linked immunosorbent assay) over other serological tests?

Accepted Answer

It is sensitive, can quantify antigen or antibody, and is easy to automate.

Question 12

Which of the following best describes the principle behind the viral neutralization test?

Accepted Answer

Antibodies neutralize the virus, preventing cytopathic effects in cell culture.

Question 13

Which serological test is commonly used to confirm infection with HIV after an initial positive ELISA?

Accepted Answer

Immunoblot (Western blot)

Question 14

What is the main limitation of passive immunotherapy using antiserum?

Accepted Answer

Antibodies are degraded quickly and do not protect against future infections.

Question 15

Which of the following equations would you use to calculate the antibody titer in a titration assay?

Accepted Answer

The titer is the reciprocal of the highest dilution of serum that still gives a positive reaction: $$	ext{Titer} = \frac{1}{	ext{Dilution}}$$

Question 16

Which of the following is a real-world application of immunochromatographic assays?

Accepted Answer

Pregnancy testing

Question 17

Which of the following statements about adjuvants in vaccines is correct?

Accepted Answer

Adjuvants are chemicals added to vaccines to increase effective antigenicity.

Question 18

Which of the following best describes the process of producing monoclonal antibodies using hybridomas?

Accepted Answer

Hybridomas are formed by fusing plasma cells with myeloma cells, then cloned to produce antibodies against a specific antigen.

Question 19

Which of the following is a key difference between agglutination and precipitation reactions?

Accepted Answer

Agglutination involves the clumping of insoluble particles, while precipitation involves aggregation of soluble molecules.

Immunization and Immune Testing: Principles and Applications

Study Guide - Practice Questions

Study Guide - Flashcards