Q: Which formula correctly represents the prevalence rate of a disease?

$$\text{Prevalence rate} = \frac{\text{Number of existing cases}}{\text{Total population}} \times 100$$

Question 1

Which of the following best describes an opportunistic pathogen?

Accepted Answer

A pathogen that only causes disease in a weakened host.

Question 2

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

Accepted Answer

Endemic

Question 3

Which of the following is NOT a category of pathogen?

Accepted Answer

Algae

Question 4

During which stage of infectious disease is the patient most likely to experience mild, non-specific symptoms?

Accepted Answer

Prodromal phase

Question 5

Which of the following best describes the period of decline in an infectious disease?

Accepted Answer

Pathogen replication decreases and the patient begins to recover.

Question 6

A patient who harbors a pathogen for an extended period without experiencing symptoms is known as:

Accepted Answer

An asymptomatic carrier

Question 7

Which of the following is a direct contact mode of transmission?

Accepted Answer

Person-to-person handshake

Question 8

Which of the following is a measure of frequency in epidemiology?

Accepted Answer

Prevalence rate

Question 9

If a disease has a high incidence rate and a long duration, what can be said about its prevalence?

Accepted Answer

Prevalence will be high.

Question 10

Which of the following is NOT a reason why Koch’s postulates may not apply to a particular infectious disease?

Accepted Answer

The pathogen can be easily cultured in the lab.

Question 11

A hospital is tracking the number of new cases of a specific infection each month. Which epidemiological measure are they most likely using?

Accepted Answer

Incidence rate

Question 12

Which of the following best describes herd immunity?

Accepted Answer

Immunity that occurs when a large portion of a community is immune, protecting those who are not.

Question 13

Which of the following is a key public health strategy to break the epidemiological triangle?

Accepted Answer

Public education

Question 14

A patient develops an infection from bacteria that were already present in their own body. This is an example of:

Accepted Answer

Endogenous source

Question 15

Which of the following is a common source of healthcare-acquired infections (HAIs)?

Accepted Answer

Contaminated medical devices

Question 16

Which of the following is a requirement for a disease to be a good candidate for eradication?

Accepted Answer

It must be easily identifiable and preventable.

Question 17

Which of the following best describes the ethical violation in the Tuskegee syphilis experiment?

Accepted Answer

Participants were not informed of their disease and denied treatment.

Question 18

Which formula correctly represents the prevalence rate of a disease?

Accepted Answer

$$	ext{Prevalence rate} = \frac{	ext{Number of existing cases}}{	ext{Total population}} 	imes 100$$

Question 19

A researcher wants to determine if a new vaccine is effective in reducing the incidence of a disease. Which epidemiological measure should they focus on?

Accepted Answer

Incidence rate

Question 20

Which of the following is an example of an analytical epidemiology study?

Accepted Answer

An experimental study testing the effectiveness of a new drug

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