Question 1

Which of the following best describes an opportunistic pathogen?

Accepted Answer

A pathogen that only causes disease in weakened hosts or when normal microbiota is disrupted.

Question 2

Which of the following is an example of a communicable disease?

Accepted Answer

Influenza transmitted from person to person.

Question 3

A disease that is routinely detected in a population or region is classified as:

Accepted Answer

Endemic

Question 4

Which of the following best defines a pandemic?

Accepted Answer

A widespread epidemic that spreads to numerous countries.

Question 5

Which of the following is a zoonotic disease?

Accepted Answer

Rabies transmitted from animals to humans.

Question 6

Which of the following is NOT a category of pathogen?

Accepted Answer

Algae

Question 7

A patient experiencing fatigue, nausea, and headache, but no measurable fever or rash, is exhibiting:

Accepted Answer

Subjective symptoms

Question 8

Which stage of infectious disease is characterized by the elimination of the pathogen from the body?

Accepted Answer

Convalescent period

Question 9

Which of the following equations correctly calculates the attack rate in an epidemic?

Accepted Answer

$$Attack\ Rate = \frac{Number\ of\ new\ cases}{Population\ at\ risk} 	imes 100$$

Question 10

Which of the following is a key goal of epidemiology?

Accepted Answer

To monitor and control disease occurrence to promote health in populations.

Question 11

Which of the following is an example of indirect contact transmission?

Accepted Answer

Receiving a contaminated needle stick.

Question 12

Which of the following is a biological vector?

Accepted Answer

A mosquito transmitting malaria.

Question 13

Which of the following factors contributes to the emergence of new infectious diseases?

Accepted Answer

Increased travel and global movement.

Question 14

Which of the following is true about eradication of infectious diseases?

Accepted Answer

Eradication means there are no longer any cases of the disease anywhere in the world.

Question 15

Which of the following is a plausible reason for the reemergence of a previously controlled disease?

Accepted Answer

Pathogen evolution leading to increased virulence.

Question 16

Which of the following best describes the epidemiological triangle?

Accepted Answer

It links host, environment, and etiological agent.

Question 17

Which of the following is a correct statement about latent infections?

Accepted Answer

The pathogen can exist in a dormant state and reactivate later.

Question 18

Which of the following is a correct formula for calculating incidence rate?

Accepted Answer

$$Incidence\ Rate = \frac{Number\ of\ new\ cases}{Total\ population\ at\ risk\ during\ a\ time\ period}$$

Question 19

Which of the following public health strategies is most effective for breaking the epidemiological triangle for a highly contagious disease with a short incubation period?

Accepted Answer

Quarantine of exposed individuals.

Question 20

Which of the following is a plausible challenge in eradicating a disease caused by a pathogen capable of latent infection?

Accepted Answer

Latent pathogens can remain dormant and reactivate, making complete elimination difficult.

Principles of Infectious Disease and Epidemiology: Key Terminology and Concepts

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