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

$$\text{Prevalence} = \frac{\text{Total number of cases}}{\text{Total population}}$$

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

$$\text{Incidence rate} = \frac{\text{Number of new cases}}{\text{Population at risk during a specific time}}$$

Question 1

Which of the following best describes an opportunistic pathogen?

Accepted Answer

A pathogen that only causes disease when the host's immune system is weakened.

Question 2

A disease that is routinely detected in a specific population or region is called:

Accepted Answer

Endemic

Question 3

Which of the following is NOT a direct contact mode of disease transmission?

Accepted Answer

Contaminated water

Question 4

A patient is infected with a pathogen but does not show any signs or symptoms. This is best described as:

Accepted Answer

A latent infection

Question 5

Which of the following is a measure of the number of new cases of a disease in a defined population during a specific time frame?

Accepted Answer

Incidence rate

Question 6

A hospital patient develops a urinary tract infection after catheterization. This infection is best classified as:

Accepted Answer

A healthcare-acquired infection (HAI)

Question 7

Which of the following is a key component of the epidemiological triangle?

Accepted Answer

Host

Question 8

Which of the following best describes the acute phase of an infectious disease?

Accepted Answer

The patient experiences full-blown classical symptoms of the disease.

Question 9

Which of the following is NOT a basic public health strategy to prevent disease?

Accepted Answer

Alternative prevention

Question 10

Which of the following statements about gloves and hand hygiene in healthcare settings is correct?

Accepted Answer

Gloves should never be considered a replacement for hand washing.

Question 11

Which of the following is the best candidate for eradication?

Accepted Answer

A human-specific, easily identifiable, and preventable disease

Question 12

A researcher wants to determine the effectiveness of a new vaccine by randomly assigning participants to receive either the vaccine or a placebo. This is an example of:

Accepted Answer

An experimental study

Question 13

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

Accepted Answer

$$	ext{Prevalence} = \frac{	ext{Total number of cases}}{	ext{Total population}}$$

Question 14

A patient is infected with a pathogen that remains dormant in the body and can reactivate later. This patient is best described as:

Accepted Answer

A chronic carrier

Question 15

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

Accepted Answer

Bacteria from the patient's own skin entering a surgical incision

Question 16

Which of the following is a correct statement about herd immunity?

Accepted Answer

It occurs when a high percentage of the population is immune, preventing pathogen persistence.

Question 17

A case report describes a single patient with a rare disease. This type of study is best classified as:

Accepted Answer

Descriptive epidemiology

Question 18

Which of the following is a common misconception about correlation in epidemiological studies?

Accepted Answer

Correlation implies causation.

Question 19

Which of the following is NOT a common source of healthcare-acquired infections (HAIs)?

Accepted Answer

Freshly sterilized surgical instruments

Question 20

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

Accepted Answer

$$	ext{Incidence rate} = \frac{	ext{Number of new cases}}{	ext{Population at risk during a specific time}}$$

Chapter 9 Principles of Infectious Disease and Epidemiology: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards