$$\text{Morbidity Rate} = \frac{\text{Number of people affected}}{\text{Total population}}$$

Question 1

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

Accepted Answer

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

Question 2

A patient develops a yeast infection after taking antibiotics for a bacterial infection. This is an example of which type of pathogen?

Accepted Answer

Opportunistic pathogen

Question 3

Which of Koch’s postulates is violated if a suspected pathogen cannot be grown in pure culture?

Accepted Answer

The pathogen must be isolated from the diseased host and grown in pure culture.

Question 4

Which of the following is an example of vehicle transmission?

Accepted Answer

A person contracts Salmonella after eating undercooked chicken.

Question 5

Which of the following best describes herd immunity?

Accepted Answer

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

Question 6

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

Accepted Answer

Endemic

Question 7

Which of the following is a key factor in the development of healthcare-associated infections (HAIs)?

Accepted Answer

Microorganisms in the healthcare environment, compromised hosts, and a chain of transmission

Question 8

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

Accepted Answer

A mosquito transmits malaria after the parasite reproduces inside it.

Question 9

Which of the following equations correctly represents the calculation of morbidity rate?

Accepted Answer

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

Question 10

Which of the following best describes the prodromal period in the development of disease?

Accepted Answer

A short period after incubation with early, mild symptoms

Question 11

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

Accepted Answer

Subclinical disease

Question 12

Which of the following is a correct example of mutualism in the human microbiome?

Accepted Answer

E. coli in the large intestine producing vitamin K

Question 13

Which of the following is NOT a reason for the emergence or reemergence of infectious diseases?

Accepted Answer

Improved sanitation and hygiene

Question 14

Which of the following best describes a zoonosis?

Accepted Answer

A disease transmitted from animals to humans

Question 15

Which of the following is an example of indirect contact transmission?

Accepted Answer

A person contracts a cold after touching a contaminated doorknob.

Question 16

Which of the following is a correct equation for calculating the attack rate?

Accepted Answer

$$	ext{Attack Rate} = \frac{	ext{Number of cases}}{	ext{Number of people exposed}} 	imes 100$$

Question 17

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

Accepted Answer

Inherited traits such as the sickle cell gene

Question 18

Which of the following is the best example of a latent disease?

Accepted Answer

Tuberculosis that remains dormant for years before causing symptoms

Question 19

Which of the following is the most effective way to reduce the number of pathogens in a healthcare setting?

Accepted Answer

Handwashing

Question 20

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

Accepted Answer

The CDC collects, analyzes, and publishes epidemiological information in the United States.

Principles of Disease and Epidemiology: Microbiology Study Notes

Study Guide - Practice Questions