Q: Which equation best represents the calculation of vaccine efficacy ($$VE) $$given attack rates in vaccinated ($$AR_v) $$and unvaccinated ($$AR_u) $$populations?

$$VE = \frac{AR_u - AR_v}{AR_u} \times 100$$

Question 1

Which of the following best describes the mechanism of action for the DTaP vaccine?

Accepted Answer

It contains inactivated toxins (toxoids) and purified antigens to induce antibody production.

Question 2

A patient receives the MMR vaccine. Which type of immunity is primarily induced?

Accepted Answer

Active immunity, as the patient's own immune system produces antibodies and memory cells.

Question 3

Which of the following is a characteristic of Type I hypersensitivity reactions?

Accepted Answer

They involve IgE antibodies binding to mast cells, leading to histamine release.

Question 4

A child develops a rash after receiving a vaccine containing killed viral particles. Which type of hypersensitivity is most likely involved?

Accepted Answer

Type IV (Delayed, T cell-mediated)

Question 5

Which equation best represents the calculation of vaccine efficacy ($$VE) $$given attack rates in vaccinated ($$AR_v) $$and unvaccinated ($$AR_u) $$populations?

Accepted Answer

$$VE = \frac{AR_u - AR_v}{AR_u} 	imes 100$$

Question 6

A patient with a history of penicillin allergy develops bronchial swelling and hypotension within minutes of exposure. Which immunological mechanism is responsible?

Accepted Answer

IgE-mediated mast cell degranulation releasing histamine

Question 7

Which of the following is NOT a component of the DTaP vaccine?

Accepted Answer

Polio virus

Question 8

A newborn develops hemolytic disease due to Rh incompatibility. Which antibody class is responsible for crossing the placenta and causing this condition?

Accepted Answer

IgG

Question 9

Which of the following best explains why passive immunization is used for rabies exposure?

Accepted Answer

It provides immediate protection by supplying pre-formed antibodies.

Question 10

A patient tests positive in the Mantoux test. What does this result indicate?

Accepted Answer

The patient has been exposed to Mycobacterium tuberculosis and has a cell-mediated immune response.

Question 11

Which of the following substances is most likely to cause allergic contact dermatitis via a Type IV hypersensitivity reaction?

Accepted Answer

Nickel in jewelry

Question 12

Which vaccine type is most likely to require booster doses to maintain immunity?

Accepted Answer

Inactivated (killed) vaccines

Question 13

A patient receives an injection of pre-formed antibodies after exposure to hepatitis B. Which type of immunity is this?

Accepted Answer

Passive artificial immunity

Question 14

Which of the following best describes the role of IgE in Type I hypersensitivity?

Accepted Answer

IgE binds to mast cells and basophils, sensitizing them to allergens.

Question 15

Which of the following is a real-world example of a Type II hypersensitivity reaction?

Accepted Answer

Hemolytic transfusion reaction due to ABO incompatibility

Question 16

A patient develops serum sickness after receiving horse-derived antitoxin. Which immunological process is responsible?

Accepted Answer

Formation of immune complexes between foreign proteins and host antibodies

Question 17

Which cell type is primarily responsible for the delayed response in Type IV hypersensitivity?

Accepted Answer

Helper T lymphocytes (CD4+)

Question 18

Which of the following is a key advantage of conjugated polysaccharide vaccines over plain polysaccharide vaccines?

Accepted Answer

They induce a stronger T cell-dependent immune response, especially in young children.

Question 19

A patient with a peanut allergy experiences rapid onset of bronchial swelling and hypotension after exposure. Which term best describes this reaction?

Accepted Answer

Anaphylaxis

Question 20

Which of the following best explains why the Mantoux test is used to diagnose tuberculosis exposure?

Accepted Answer

It detects a delayed-type hypersensitivity reaction mediated by T cells to tuberculin.

M4- Vaccines and Hypersensitivity: Study Guide and Review for Microbiology

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