Question 1

Which of the following best describes the difference between a microbe and a pathogen?

Accepted Answer

A microbe is any microscopic organism, while a pathogen is a microbe capable of causing disease.

Question 2

Which of the following is NOT one of Koch’s original postulates for proving a microbe causes a specific disease?

Accepted Answer

The microorganism must be resistant to all antibiotics.

Question 3

A patient is infected with a microorganism but does not show any symptoms. According to the study materials, which of the following is true?

Accepted Answer

The patient may still transmit the microorganism to others even without symptoms.

Question 4

Which of the following is a limitation of Koch’s postulates?

Accepted Answer

Some pathogens cannot be grown in pure culture.

Question 5

Which of the following best describes the epidemiological triangle?

Accepted Answer

It consists of the host, the environment, and the etiological agent.

Question 6

Which of the following is an example of an endogenous source of infection?

Accepted Answer

A patient develops a yeast infection after taking antibiotics that disrupt normal vaginal microbiota.

Question 7

Which of the following is the correct order of the five general stages of infectious disease?

Accepted Answer

Incubation, prodromal, illness, decline, convalescence

Question 8

Which of the following best defines 'morbidity rate'?

Accepted Answer

The number of people affected by a disease in relation to the total population in a given time period.

Question 9

Which of the following is an example of a communicable but not highly contagious disease?

Accepted Answer

HIV/AIDS

Question 10

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

Accepted Answer

Endemic

Question 11

Which of the following is a real-world example of breaking the chain of infection at the 'host' corner of the epidemiological triangle?

Accepted Answer

Vaccinating residents in a nursing home against influenza

Question 12

Which of the following best describes a 'zoonotic' disease?

Accepted Answer

A disease that spreads from animals to humans

Question 13

Which of the following is a key goal of epidemiology?

Accepted Answer

Describe and track disease in human populations

Question 14

Which of the following is an example of indirect transmission?

Accepted Answer

Contracting norovirus from a contaminated doorknob (fomite)

Question 15

Which of the following best describes 'dysbiosis'?

Accepted Answer

A disruption of the normal microbiota leading to disease

Question 16

Which of the following is a reason why healthcare settings are considered 'hot zones' for antibiotic-resistant pathogens?

Accepted Answer

High antibiotic use and vulnerable patient populations

Question 17

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

Accepted Answer

$$ 	ext{Morbidity Rate} = \frac{	ext{Number of cases of disease}}{	ext{Total population}} 	imes 100 $$

Question 18

Which of the following is an example of a vehicle transmission?

Accepted Answer

A person contracts Salmonella from contaminated chicken salad at a picnic.

Question 19

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

Accepted Answer

An epidemic is a widespread outbreak in a region; a pandemic is an epidemic that spreads across multiple countries.

Question 20

Which of the following is a real-world example of an emerging pathogen?

Accepted Answer

SARS-CoV-2 causing COVID-19

Principles of Infectious Disease and Epidemiology: Core Concepts and Applications

Study Guide - Practice Questions