Q: Based on the bathtub diagram, which equation correctly represents the relationship between incidence, prevalence, recovery, and death in a population?

$$\text{Prevalence} = \text{Incidence} - (\text{Recovery} + \text{Death})$$

Q: Which equation best represents the calculation of disease incidence in a population?

$$\text{Incidence} = \frac{\text{Number of new cases}}{\text{Population at risk}}$$

Question 1

Which of the following best describes the role of 'Typhoid Mary' in the spread of typhoid fever, as illustrated in the provided image?

Accepted Answer

She was an asymptomatic carrier who transmitted Salmonella typhi via food preparation.

Question 2

Based on the bathtub diagram, which equation correctly represents the relationship between incidence, prevalence, recovery, and death in a population?

Accepted Answer

$$	ext{Prevalence} = 	ext{Incidence} - (	ext{Recovery} + 	ext{Death})$$

Question 3

Which of the following is NOT considered a reservoir of infection?

Accepted Answer

Sterile surgical instruments

Question 4

Which of the following conditions can cause normal microbiota to become opportunistic pathogens?

Accepted Answer

All of the above

Question 5

Which part of the human body is normally sterile?

Accepted Answer

Bloodstream

Question 6

Which of the following is a key difference between exotoxins and endotoxins?

Accepted Answer

Exotoxins are proteins, while endotoxins are lipopolysaccharides.

Question 7

Which of the following is an example of a biological vector in disease transmission?

Accepted Answer

A mosquito transmitting malaria

Question 8

What is the primary function of the US Centers for Disease Control and Prevention (CDC)?

Accepted Answer

To record and analyze data on disease occurrence and recommend prevention strategies

Question 9

Which of the following best describes the term 'nosocomial infection'?

Accepted Answer

An infection acquired in a healthcare setting

Question 10

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

Accepted Answer

Handwashing by healthcare workers

Question 11

Which of the following is a plausible scenario for microbial antagonism?

Accepted Answer

Resident microbiota outcompete pathogens for nutrients

Question 12

Which of the following is a sign, rather than a symptom, of infectious disease?

Accepted Answer

Fever measured by thermometer

Question 13

Which equation best represents the calculation of disease incidence in a population?

Accepted Answer

$$	ext{Incidence} = \frac{	ext{Number of new cases}}{	ext{Population at risk}}$$

Question 14

Which of the following is an example of a noncommunicable disease?

Accepted Answer

Tetanus

Question 15

Which of the following is a predisposing factor for infectious disease?

Accepted Answer

All of the above

Question 16

Which scientist is credited with introducing handwashing to reduce the spread of infectious diseases in hospitals?

Accepted Answer

Ignaz Semmelweis

Question 17

Which of the following is an example of a zoonotic disease?

Accepted Answer

Lyme disease

Question 18

Which of the following is a portal of entry for pathogens?

Accepted Answer

All of the above

Question 19

Which of the following best describes the function of adhesion proteins as a virulence factor?

Accepted Answer

They allow pathogens to attach to host cells.

Question 20

Which of the following is a plausible route of exit for pathogens from the human body?

Accepted Answer

All of the above

Chapter 14: Infection, Infectious Diseases, and Epidemiology – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards