Question 1

Which of the following best defines 'etiology' in the context of microbiology?

Accepted Answer

The study of the cause of a disease.

Question 2

A patient develops a disease after being exposed to a microbe in a hospital setting. Which term best describes this type of infection?

Accepted Answer

Healthcare-associated infection

Question 3

Which of the following is an example of mutualism in the human microbiome?

Accepted Answer

Escherichia coli in the large intestine synthesizing vitamin K for the host.

Question 4

Which of the following is NOT one of Koch’s postulates?

Accepted Answer

The microorganism must be able to survive outside the host for at least 24 hours.

Question 5

A disease that is constantly present in a population, such as malaria in certain regions, is best described as:

Accepted Answer

Endemic

Question 6

Which of the following best describes herd immunity?

Accepted Answer

The resistance of a population to the spread of an infectious disease due to a high proportion of individuals being immune.

Question 7

Which of the following is a predisposing factor for disease?

Accepted Answer

All of the above

Question 8

Arrange the following stages of disease in the correct order: period of illness, period of convalescence, incubation period, prodromal period, period of decline.

Accepted Answer

Incubation period, prodromal period, period of illness, period of decline, period of convalescence

Question 9

Which of the following is an example of a nonliving reservoir of infection?

Accepted Answer

A contaminated water source

Question 10

Which method of disease transmission is best illustrated by a healthcare worker failing to wash hands between patients?

Accepted Answer

Direct contact transmission

Question 11

A patient with a weakened immune system is more likely to develop infections. What term best describes this patient?

Accepted Answer

Compromised host

Question 12

Which of the following is a likely reason for the emergence of a new infectious disease?

Accepted Answer

All of the above

Question 13

Which of the following best describes the function of the CDC (Centers for Disease Control and Prevention)?

Accepted Answer

To collect and analyze epidemiological information in the United States.

Question 14

Which of the following terms is defined as the number of people in a population who develop a disease during a particular time period?

Accepted Answer

Morbidity

Question 15

A disease that is not spread from one host to another is best described as:

Accepted Answer

Noncommunicable

Question 16

Which of the following is an example of an opportunistic microorganism?

Accepted Answer

Staphylococcus epidermidis causing infection in a surgical wound

Question 17

Which of the following is NOT a method of disease transmission in hospitals?

Accepted Answer

Vaccination of patients

Question 18

Which type of epidemiologic investigation involves comparing a group of people with a disease to a group without the disease?

Accepted Answer

Analytical

Question 19

Which of the following best describes a notifiable infectious disease?

Accepted Answer

A disease that must be reported to public health authorities

Question 20

A patient develops pneumonia after being treated with broad-spectrum antibiotics for a urinary tract infection. Which concept does this scenario best illustrate?

Accepted Answer

Opportunistic infection

Principles of Disease and Epidemiology: Study Guide

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