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 effective vaccines for both diseases

Question 2

Which advantage is unique to attenuated (live) vaccines compared to inactivated (killed) vaccines?

Accepted Answer

They stimulate both humoral and cell-mediated immunity, often providing lifelong protection

Question 3

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

Accepted Answer

Some vaccines are manufactured using chicken eggs, which may contain egg proteins

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 describes the relationship between the diameter of the precipitation ring and antigen concentration in radial immunodiffusion?

Accepted Answer

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

Question 6

In an agglutination test for blood typing, what result would you expect if anti-A antibody is added to a blood sample and agglutination occurs?

Accepted Answer

The blood sample is type A

Question 7

Which of the following statements about ELISA is correct?

Accepted Answer

ELISA can detect and quantify both antigens and antibodies in a sample

Question 8

A patient receives antiserum containing preformed antibodies after exposure to rabies. Which type of immunity is this?

Accepted Answer

Passive immunization

Question 9

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

Accepted Answer

Antibodies are degraded quickly and may trigger allergic reactions called serum sickness

Question 10

Which step in the production of monoclonal antibodies involves the fusion of plasma cells and myeloma cells?

Accepted Answer

Formation of hybridomas

Question 11

Which of the following best describes the principle of the complement fixation test?

Accepted Answer

Detection of membrane attack complexes generated during complement activation

Question 12

In a viral neutralization test, what does the absence of cytopathic effect indicate?

Accepted Answer

Presence of antibodies against the virus in the sample

Question 13

Which of the following is a key advantage of immunochromatographic dipstick tests?

Accepted Answer

They provide rapid and easy-to-read results for antigen detection

Question 14

Which of the following is true about toxoid vaccines?

Accepted Answer

They use chemically or thermally modified toxins to stimulate active immunity

Question 15

Which equation would you use to calculate the antibody titer in an agglutination test, given serial dilutions?

Accepted Answer

$$	ext{Titer} = \frac{1}{	ext{highest dilution showing agglutination}}$$

Question 16

Which of the following is a reason why vaccine-associated risks discourage investment in new vaccine development?

Accepted Answer

Potential for mild toxicity and rare cases of anaphylactic shock

Question 17

Which of the following best describes the difference between precipitation and agglutination reactions?

Accepted Answer

Precipitation involves soluble molecules, while agglutination involves insoluble particles

Question 18

Which of the following is a benefit of combination vaccines?

Accepted Answer

They allow simultaneous administration of antigens from several pathogens

Question 19

Which of the following is a common misconception about vaccines that has not been substantiated by research?

Accepted Answer

Vaccines cause autism, diabetes, and asthma

Question 20

Which of the following is a key feature of the Western blot test?

Accepted Answer

It can detect antibodies against multiple antigens and is less subject to misinterpretation

Chapter 17

Study Guide - Practice Questions