Q: Which of the following is the correct formula for calculating incidence rate in a population?

$$\text{Incidence Rate} = \frac{\text{Number of new cases during a time period}}{\text{Population at risk during the same period}}$$

Q: Which of the following is the correct formula for calculating prevalence in a population?

$$\text{Prevalence} = \frac{\text{Total number of cases (new and existing) at a specific time}}{\text{Total population at that time}}$$

Question 1

Which of the following best describes the difference between incidence and prevalence in epidemiology?

Accepted Answer

Incidence measures the number of new cases in a population during a specific time period, while prevalence measures the total number of cases (new and existing) at a given time.

Question 2

A patient acquires a Clostridioides difficile infection while hospitalized for surgery. What type of infectious disease pattern does this represent?

Accepted Answer

Nosocomial infection

Question 3

Which of the following is an example of a biological vector in disease transmission?

Accepted Answer

A mosquito transmitting Zika virus through a bite

Question 4

Measles was considered eliminated in the U.S. 20 years ago, but cases began occurring again 10 years ago. What pattern of infectious disease does this represent?

Accepted Answer

Reemerging

Question 5

Which of the following best describes the etiology of COVID-19?

Accepted Answer

It is caused by the virus SARS-CoV-2.

Question 6

A disease that is constantly present at a fairly constant level in a population, such as malaria in Nigeria, is best described as:

Accepted Answer

Endemic

Question 7

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

Accepted Answer

$$	ext{Incidence Rate} = \frac{	ext{Number of new cases during a time period}}{	ext{Population at risk during the same period}}$$

Question 8

A hospital reports an increase in drug-resistant tuberculosis cases after a period of decline. This is an example of:

Accepted Answer

Reemerging infectious disease

Question 9

Which of the following is NOT a possible portal of entry for a pathogen?

Accepted Answer

Intact skin

Question 10

A person contracts a gastrointestinal infection after eating contaminated food at a picnic. What is the most likely transmission route?

Accepted Answer

Vehicle transmission

Question 11

Which of the following best describes a pandemic?

Accepted Answer

An epidemic that occurs on multiple continents

Question 12

Which of the following is an example of indirect transmission via a fomite?

Accepted Answer

A person touching a doorknob contaminated with rhinovirus and then touching their face

Question 13

Which of the following statements about emerging infectious diseases is correct?

Accepted Answer

They are diseases that are new to the human population or have increased in prevalence in the last 20 years.

Question 14

A patient with active tuberculosis coughs, releasing respiratory droplets that infect another person standing 2 feet away. What is the most likely mode of transmission?

Accepted Answer

Droplet transmission

Question 15

Which of the following is the correct formula for calculating prevalence in a population?

Accepted Answer

$$	ext{Prevalence} = \frac{	ext{Total number of cases (new and existing) at a specific time}}{	ext{Total population at that time}}$$

Question 16

Which of the following is an example of vertical transmission?

Accepted Answer

A pregnant woman transmitting HIV to her fetus

Question 17

Which of the following is a nonliving reservoir for pathogens?

Accepted Answer

A contaminated water source

Question 18

A public health official is tracking the number of new HIV infections in a city over the past year. Which epidemiological measure is being used?

Accepted Answer

Incidence

Question 19

Which of the following best describes a mechanical vector?

Accepted Answer

An insect that carries a pathogen externally, such as a fly transferring bacteria from feces to food

Question 20

A new strain of Ebola virus is identified and begins to spread in a region where it was not previously found. This is an example of:

Accepted Answer

Emerging infectious disease

Epidemiology: Patterns, Transmission, and Tracking of Infectious Diseases

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