Q: Which of the following equations correctly represents the calculation of disease prevalence?

$$\text{Prevalence} = \frac{\text{Total number of cases}}{\text{Population at risk}}$$

Question 1

Which stage of infectious disease is characterized by the highest number of microorganisms and the most severe signs and symptoms?

Accepted Answer

Illness

Question 2

A patient develops symptoms of cholera two days after drinking contaminated water. Based on Table 14.9, which term best describes the time between exposure and symptom onset?

Accepted Answer

Incubation period

Question 3

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

Accepted Answer

Touching a doorknob contaminated with pathogens

Question 4

A person contracts malaria after being bitten by a mosquito. What type of transmission is this?

Accepted Answer

Biological vector transmission

Question 5

Which portal of exit is most likely involved when a person spreads tuberculosis by coughing?

Accepted Answer

Mouth (saliva, sputum)

Question 6

Which of the following diseases has the longest incubation period according to Table 14.9?

Accepted Answer

Leprosy

Question 7

A hospital patient develops a urinary tract infection from their own normal microbiota after antibiotic treatment. What type of healthcare-associated infection is this?

Accepted Answer

Endogenous

Question 8

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

Accepted Answer

Incidence is the number of new cases; prevalence is the total number of cases.

Question 9

Which of the following is the most effective way to reduce healthcare-associated infections (HAIs)?

Accepted Answer

Handwashing

Question 10

A public health agency is investigating a sudden outbreak of foodborne illness. Which type of epidemiological study are they most likely conducting?

Accepted Answer

Analytical epidemiology

Question 11

Which of the following equations correctly represents the calculation of disease prevalence?

Accepted Answer

$$	ext{Prevalence} = \frac{	ext{Total number of cases}}{	ext{Population at risk}}$$

Question 12

Which of the following is an example of vehicle transmission?

Accepted Answer

A person eats undercooked meat contaminated with Salmonella

Question 13

Which term describes a disease that is constantly present at a low level in a population?

Accepted Answer

Endemic

Question 14

A patient develops pneumonia after being intubated during surgery. What type of healthcare-associated infection is this?

Accepted Answer

Iatrogenic

Question 15

Which of the following is a role of public health agencies in controlling infectious diseases?

Accepted Answer

Enforcing cleanliness of water and food supplies

Question 16

Which of the following best describes a superinfection?

Accepted Answer

An infection resulting from the use of antimicrobial drugs that suppress normal microbiota

Question 17

Which of the following is NOT a portal of exit for pathogens?

Accepted Answer

Liver (bile)

Question 18

Which of the following best describes a chronic disease?

Accepted Answer

A disease with usually mild symptoms that develop slowly and last a long time

Question 19

Which of the following is an example of a mechanical vector?

Accepted Answer

Housefly

Question 20

Which of the following best describes the role of analytical epidemiology?

Accepted Answer

Determining the probable cause, mode of transmission, and methods of prevention

Infection, Infectious Diseases, and Epidemiology: Study Notes

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