Question 1

Which of the following best describes the mechanism by which vaccines confer long-term protection against infectious diseases?

Accepted Answer

Vaccines expose the body to antigens, leading to the formation of memory cells that recognize and fight future infections.

Question 2

Edward Jenner's experiment in 1796 involved which of the following steps to demonstrate immunity to smallpox?

Accepted Answer

He exposed an 8-year-old boy to cowpox, then later to smallpox, showing protection from smallpox.

Question 3

Which type of vaccine is most likely to provide 'contact immunity' to people who have not been vaccinated?

Accepted Answer

Live-attenuated (weakened pathogen) vaccine

Question 4

Why are booster doses necessary for inactivated and subunit vaccines?

Accepted Answer

Because they do not replicate in the body, so repeated exposure is needed to achieve full immunity.

Question 5

Which of the following is a plausible reason for vaccine hesitancy in a population?

Accepted Answer

Misinformation and myths about vaccine safety

Question 6

A patient receives a vaccine containing inactivated virus. Which type of immunity is primarily stimulated?

Accepted Answer

Adaptive immunity

Question 7

Which historical figure introduced the practice of variolation to Europe after observing it in the Ottoman Empire?

Accepted Answer

Lady Mary Wortley Montagu

Question 8

What is the main difference between correlation and causation in the context of vaccine studies?

Accepted Answer

Correlation means two variables move together, while causation means one variable directly causes another.

Question 9

Which of the following vaccine types uses a harmless virus to deliver genetic material coding for an antigen?

Accepted Answer

Viral vector vaccine

Question 10

Why should pregnant women avoid live-attenuated vaccines?

Accepted Answer

Attenuated pathogens might cross the placenta and harm the developing baby.

Question 11

Which of the following best explains why smallpox was eradicated globally?

Accepted Answer

Effective global vaccination campaigns eliminated natural transmission.

Question 12

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

Accepted Answer

Inactivated (killed pathogen) vaccine

Question 13

A person receives a subunit vaccine. What is the main component of this vaccine?

Accepted Answer

Antigenic fragments of the pathogen

Question 14

Which of the following is NOT a plausible consequence of misinformation about vaccines?

Accepted Answer

Increased vaccine uptake

Question 15

Which equation best represents the concept of correlation between two variables X and Y?

Accepted Answer

$$r = \frac{\sum (X_i - \bar{X})(Y_i - \bar{Y})}{\sqrt{\sum (X_i - \bar{X})^2$ \sum (Y_i - \bar{Y})^2$}}$$

Question 16

Which of the following statements about adaptive immunity is correct?

Accepted Answer

Adaptive immunity develops throughout life and provides targeted, specific protection.

Question 17

Which of the following is a real-world example of a vaccine that uses the mRNA platform?

Accepted Answer

COVID-19 vaccine (Pfizer-BioNTech or Moderna)

Question 18

What is the primary function of B memory cells generated after vaccination?

Accepted Answer

To recognize and mount a rapid response upon re-exposure to the same antigen

Question 19

Which of the following best describes the role of toxoid vaccines?

Accepted Answer

They use inactivated toxins to stimulate immunity without causing disease.

Question 20

A population is exposed to a new vaccine. Which equation best describes the probability $$P of an $$individual developing immunity after $$n$$ doses, assuming each dose has an independent probability $$p of $$success?

Accepted Answer

$$P = 1 - (1 - p)^n$$

Vaccines: History, Types, and Mechanisms of Action

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