Q: What is the formula for calculating prevalence rate?

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

Q: What is the formula for calculating morbidity rate?

$$\text{Morbidity rate} = \frac{\text{Number of new cases during a specific period}}{\text{Number of individuals in population}}$$

Q: What is the formula for calculating mortality rate?

$$\text{Mortality rate} = \frac{\text{Number of deaths due to given disease}}{\text{Total number of cases of the disease}}$$

Question 1

Which of the following best describes the role of an epidemiologist?

Accepted Answer

Evaluates occurrence, determinants, distribution, and control of health and disease in a defined human population.

Question 2

Which statistical measure is used to determine the total number of individuals infected at any one time in a population?

Accepted Answer

Prevalence rate

Question 3

What is the formula for calculating prevalence rate?

Accepted Answer

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

Question 4

Which term describes a disease that occurs occasionally and at irregular intervals?

Accepted Answer

Sporadic disease

Question 5

A sudden, unexpected occurrence of disease in a limited segment of the population is called:

Accepted Answer

Outbreak

Question 6

Which organization functions as the national focus for developing and applying disease prevention and control in the United States?

Accepted Answer

Centers for Disease Control and Prevention (CDC)

Question 7

What is the formula for calculating morbidity rate?

Accepted Answer

$$	ext{Morbidity rate} = \frac{	ext{Number of new cases during a specific period}}{	ext{Number of individuals in population}}$$

Question 8

Which of the following is NOT a reason for increases in emerging and reemerging infectious diseases?

Accepted Answer

Improved public infrastructure

Question 9

Which type of epidemic is characterized by a rapid rise and fall in the number of cases, typically peaking within 1 to 2 weeks?

Accepted Answer

Common source epidemic

Question 10

Herd immunity can be altered by which of the following?

Accepted Answer

Introduction of new susceptible individuals into the population

Question 11

Which process describes a major change in the antigenic character of a pathogen, often resulting from the combination of two or more viruses?

Accepted Answer

Antigenic shift

Question 12

Which of the following best describes a whole-cell vaccine?

Accepted Answer

Consists of inactivated (killed) or attenuated (living but avirulent) microbes

Question 13

Which vaccine type uses a nonvirulent virus or bacterium to deliver pathogen genes encoding major antigens?

Accepted Answer

Recombinant-vector vaccine

Question 14

What is the formula for calculating mortality rate?

Accepted Answer

$$	ext{Mortality rate} = \frac{	ext{Number of deaths due to given disease}}{	ext{Total number of cases of the disease}}$$

Question 15

Which of the following is a drawback of whole-cell vaccines?

Accepted Answer

Attenuated strains may revert to being virulent.

Question 16

Which of the following is a real-world example of a disease eradicated through global vaccination efforts?

Accepted Answer

Smallpox

Question 17

Which type of vaccine directly introduces DNA into the host cell, leading to expression of pathogen DNA fragments?

Accepted Answer

DNA vaccine

Question 18

Which of the following best describes the mechanism of mRNA vaccines?

Accepted Answer

They deliver molecules of antigen-encoding mRNA to cells, which use the mRNA as a template to build foreign protein that stimulates an adaptive immune response.

Question 19

Which of the following is a plausible consequence of refusing vaccination in a population?

Accepted Answer

Increase in reemerging infectious diseases

Question 20

A propagated epidemic is most likely to occur in which scenario?

Accepted Answer

One infected individual enters a susceptible group and infection spreads to others over time.

Epidemiology and Public Health Microbiology: Core Concepts and Applications

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