Question 1

Which of the following best describes the difference between an epidemic and a pandemic?

Accepted Answer

An epidemic is a regional outbreak, while a pandemic is a global outbreak.

Question 2

A patient contracts a disease after eating contaminated food. Which mode of transmission is most likely involved?

Accepted Answer

Indirect contact

Question 3

During which stage of disease is a patient most likely to experience the most severe symptoms?

Accepted Answer

Acute

Question 4

Which of the following is a virulence factor that helps a pathogen evade the immune system?

Accepted Answer

Capsule formation

Question 5

A Gram-negative bacterium releases a toxin that causes fever and shock. What type of toxin is this?

Accepted Answer

Endotoxin

Question 6

Which equation best represents the relationship between disease prevalence ($$P$$), incidence ($$I$$), and duration ($$D) in a $$population?

Accepted Answer

$$P = I 	imes D$$

Question 7

A mother transmits HIV to her child during childbirth. This is an example of which type of transmission?

Accepted Answer

Vertical transmission

Question 8

Which of the following is NOT considered a first-line defense against infection?

Accepted Answer

White blood cells

Question 9

A patient is exposed to a pathogen but does not develop symptoms until several days later. Which stage of disease is this?

Accepted Answer

Incubation

Question 10

Which of the following best describes the role of cytokines in the immune response?

Accepted Answer

They help immune cells communicate.

Question 11

A hospital implements strict hand hygiene and quarantine protocols to prevent the spread of MRSA. Which public health strategy is this an example of?

Accepted Answer

Hygiene and quarantine

Question 12

Which of the following statements about adaptive immunity is TRUE?

Accepted Answer

It has memory and is specific.

Question 13

A pathogen enters the body, adheres to host cells, invades tissues, replicates, and is transmitted to a new host. Which step is most directly affected by the presence of adhesion molecules?

Accepted Answer

Adhesion

Question 14

Which of the following is a chemical defense that helps prevent infection?

Accepted Answer

Stomach acid

Question 15

Complement proteins play a role in which of the following?

Accepted Answer

Destroying pathogens

Question 16

Which scenario best illustrates the concept of an endogenous infection?

Accepted Answer

A patient develops a urinary tract infection from their own gut bacteria.

Question 17

Which biosafety level is required for handling pathogens that pose a high risk of aerosol-transmitted infections and require maximum containment?

Accepted Answer

Biosafety Level 4

Question 18

A patient is recovering from an infection and regaining strength. Which stage of disease is this?

Accepted Answer

Convalescence

Question 19

Which of the following is a plausible consequence of exotoxin release by bacteria?

Accepted Answer

Damage to specific body systems

Question 20

A vector-borne disease is most likely transmitted by which of the following?

Accepted Answer

Insects such as mosquitoes

Unit 3 Exam Study Guide: Infectious Diseases, Epidemiology, and Immunity

Study Guide - Practice Questions

Study Guide - Flashcards