$$\text{Morbidity Rate} = \frac{\text{Number of new cases in a time period}}{\text{Total population at risk}} \times 100$$

Question 1

Which of the following best describes the relationship between Escherichia coli and the human large intestine?

Accepted Answer

Mutualism, because both E. coli and the host benefit from the relationship.

Question 2

A patient develops pneumonia 10 days after being admitted to the hospital for knee surgery. This infection is best classified as:

Accepted Answer

A nosocomial infection

Question 3

Which of the following is NOT a limitation of Koch’s postulates?

Accepted Answer

All pathogens can be visualized with a light microscope.

Question 4

Which term describes the presence of bacteria in the blood without rapid multiplication?

Accepted Answer

Bacteremia

Question 5

A disease that is always present in a population, such as the common cold, is best described as:

Accepted Answer

Endemic

Question 6

Which of the following is an example of vehicle transmission?

Accepted Answer

A person contracts hepatitis A from contaminated water.

Question 7

Which of the following best defines 'prevalence'?

Accepted Answer

The total number of cases, both old and new, at a specific time

Question 8

A patient with HIV develops Pneumocystis pneumonia after several years. The pneumonia is best described as:

Accepted Answer

A secondary infection

Question 9

Which of the following is the most common site of nosocomial infection according to CDC data?

Accepted Answer

Urinary tract

Question 10

Which of the following best describes herd immunity?

Accepted Answer

A large proportion of a population is immune to a disease, reducing its spread

Question 11

A disease that spreads rapidly to many people in a given area in a short time is called:

Accepted Answer

Epidemic

Question 12

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

Accepted Answer

A tick transmitting Lyme disease through a bite

Question 13

Which of the following is a sign, not a symptom, of disease?

Accepted Answer

Fever

Question 14

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

Accepted Answer

Mild signs or symptoms appear

Question 15

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

Accepted Answer

$$	ext{Morbidity Rate} = \frac{	ext{Number of new cases in a time period}}{	ext{Total population at risk}} 	imes 100$$

Question 16

Which of the following is a real-world example of a zoonosis?

Accepted Answer

A person contracts rabies from a dog bite

Question 17

Which of the following is the best method to prevent nosocomial infections?

Accepted Answer

Thorough handwashing by staff and visitors

Question 18

Which of the following is an example of a non-communicable disease?

Accepted Answer

Tetanus acquired from a contaminated wound

Question 19

Which of the following best describes the role of the CDC in epidemiology?

Accepted Answer

It is the central source of epidemiological information and publishes the Morbidity and Mortality Weekly Report (MMWR).

Question 20

A case-control study in epidemiology is best described as:

Accepted Answer

A retrospective study comparing a diseased group and a healthy group to identify factors that may have preceded the disease.

Ch 14 Principles of Disease and Epidemiology: Structured Study Notes

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