Question 1

Which of the following best explains the dramatic decrease in polio and measles cases after the 1960s, as shown in the provided graph?

Accepted Answer

Introduction of highly effective vaccines leading to herd immunity

Question 2

Which advantage is unique to attenuated live vaccines compared to inactivated vaccines?

Accepted Answer

They stimulate both humoral and cell-mediated immune responses

Question 3

A patient with an egg allergy should avoid certain vaccines. Which step in vaccine production is responsible for this recommendation?

Accepted Answer

Vaccines are mass-produced by growing viruses inside chicken eggs

Question 4

Which of the following is a disadvantage of attenuated live vaccines?

Accepted Answer

They may revert to a virulent form and cause disease

Question 5

Which equation best represents the relationship between antigen concentration and ring diameter in radial immunodiffusion?

Accepted Answer

$$d = k \cdot \log(C)$$

Question 6

Which immune testing method is most appropriate for detecting the presence of antibodies against HIV in a patient's serum?

Accepted Answer

Western blot test

Question 7

What is the primary purpose of adjuvants in inactivated vaccines?

Accepted Answer

To increase the effective antigenicity and stimulate a stronger immune response

Question 8

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

Accepted Answer

They deliver mRNA encoding viral proteins, which are produced by host cells and displayed to stimulate an immune response

Question 9

Which scenario best illustrates passive immunotherapy?

Accepted Answer

A patient is injected with antiserum containing preformed antibodies for immediate protection

Question 10

In the context of herd immunity, which equation best describes the minimum proportion of the population ($$p) $$that must be immunized to stop disease transmission, given a basic reproduction number $$R_0$$?

Accepted Answer

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

Question 11

Which of the following is a key limitation of passive immunotherapy using antisera?

Accepted Answer

Antisera can trigger allergic reactions called serum sickness

Question 12

Which immune testing method uses enzyme-linked antibodies to produce a colored product, allowing quantification of antigen or antibody?

Accepted Answer

ELISA (enzyme-linked immunosorbent assay)

Question 13

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

Accepted Answer

Mixing plasma cells with myeloma cells to form hybridomas, which are then cloned to produce monoclonal antibodies

Question 14

Which of the following is a characteristic of toxoid vaccines?

Accepted Answer

They use chemically or thermally modified toxins to stimulate active immunity

Question 15

Which immune testing method is most appropriate for determining blood type?

Accepted Answer

Hemagglutination test

Question 16

Which of the following statements about the complement fixation test is correct?

Accepted Answer

It detects the presence of specific antibodies by generating membrane attack complexes during complement activation

Question 17

Which of the following best describes the principle of immunochromatography used in rapid diagnostic tests?

Accepted Answer

Antigen solution flows through a porous strip, encountering labeled antibodies and producing a visible line when antigen-antibody complexes form

Question 18

Which of the following is a reason why multiple doses are required for toxoid vaccines?

Accepted Answer

Toxoid vaccines possess few antigenic determinants

Question 19

Which of the following best explains why influenza vaccines must be updated annually?

Accepted Answer

Influenza virus constantly mutates, changing only in antibody attachment sites

Question 20

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

Accepted Answer

Precipitation involves aggregation of soluble molecules, while agglutination involves clumping of insoluble particles

Immunization and Immune Testing: Principles and Applications

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