Question 1

Which of the following best describes the difference between incidence and prevalence of a disease?

Accepted Answer

Incidence refers to new cases during a specific time period, while prevalence refers to the total number of cases at a specific time.

Question 2

A patient develops a yeast infection after taking antibiotics for a bacterial infection. This is an example of:

Accepted Answer

A secondary infection

Question 3

Which of the following is NOT a step in Koch’s postulates?

Accepted Answer

The pathogen must be able to infect only humans and not animals.

Question 4

Which of the following best illustrates mutualism in the human microbiome?

Accepted Answer

Lactobacilli in the vagina lowering pH and preventing yeast infections

Question 5

A disease that is constantly present in a population, such as the common cold, is classified as:

Accepted Answer

Endemic

Question 6

Which of the following is an example of vehicle transmission?

Accepted Answer

Drinking contaminated water and contracting cholera

Question 7

Which of the following is a predisposing factor that can increase susceptibility to infectious disease?

Accepted Answer

All of the above

Question 8

A patient is infected with hepatitis A but shows no noticeable signs or symptoms. This is an example of:

Accepted Answer

A subclinical infection

Question 9

Which of the following best describes herd immunity?

Accepted Answer

Immunity in most of a population, reducing the spread of disease

Question 10

Which of the following is a common cause of healthcare-associated infections (HAIs)?

Accepted Answer

Use of urinary catheters

Question 11

Which of the following is an example of biological vector transmission?

Accepted Answer

A mosquito transmitting malaria after the parasite reproduces inside it

Question 12

Which of the following is a reason why Koch’s postulates cannot always be applied to identify the cause of a disease?

Accepted Answer

Some microbes have never been cultured in the laboratory

Question 13

A patient develops pneumonia after being hospitalized for surgery. This infection is best classified as:

Accepted Answer

A healthcare-associated infection (HAI)

Question 14

Which of the following best describes the prodromal period of an infectious disease?

Accepted Answer

Short period after incubation with early, mild nonspecific symptoms

Question 15

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

Accepted Answer

Soil contaminated with Clostridium tetani

Question 16

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

Accepted Answer

$$	ext{Morbidity Rate} = \frac{	ext{Number of people affected}}{	ext{Total population}} 	imes 100$$

Question 17

Which of the following is a characteristic of emerging infectious diseases?

Accepted Answer

They are new, changing, or increasing in incidence

Question 18

Which of the following is an example of analytical epidemiology?

Accepted Answer

Analyzing risk factors for typhus in a population

Question 19

Which of the following best describes microbial antagonism?

Accepted Answer

Normal microbiota compete with invading microbes for nutrients and produce substances harmful to them

Question 20

A disease that spreads worldwide, such as COVID-19, is classified as:

Accepted Answer

Pandemic

(Chapter 14) Principles of Disease and Epidemiology: Study Notes for Microbiology Students

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