Q: Which of the following is a correct formula for calculating morbidity rate?

$$\text{Morbidity rate} = \frac{\text{number of people affected}}{\text{total population in a given time period}}$$

Question 1

Which of the following best describes the difference between incidence and prevalence of a disease in a population?

Accepted Answer

Incidence is the fraction of a population that contracts a disease during a specific time period, while prevalence is the fraction of a population having a specific disease at a given time.

Question 2

A patient is infected with a virus but does not show any noticeable signs or symptoms. This type of infection is best described as:

Accepted Answer

Subclinical infection

Question 3

Which of the following is an example of microbial antagonism provided by normal microbiota?

Accepted Answer

Normal microbiota producing acids that inhibit pathogen growth

Question 4

A disease that is constantly present in a population, such as malaria in certain regions, is best described as:

Accepted Answer

Endemic disease

Question 5

Which of the following is NOT a step in Koch's postulates?

Accepted Answer

The pathogen must be shown to be resistant to antibiotics.

Question 6

A patient develops pneumonia after being hospitalized for a surgical procedure. This infection is best classified as:

Accepted Answer

A healthcare-associated infection (HAI)

Question 7

Which of the following best describes a contagious disease?

Accepted Answer

A disease that is easily and rapidly spread from one host to another by direct contact or body fluids

Question 8

Which of the following is a predisposing factor that can make the body more susceptible to disease?

Accepted Answer

Inherited traits such as the sickle cell gene

Question 9

A disease outbreak occurs in multiple countries across the world within a short period. This is best described as:

Accepted Answer

Pandemic

Question 10

Which of the following is an example of vehicle transmission?

Accepted Answer

Transmission of Salmonella by contaminated food

Question 11

A patient with tuberculosis develops a secondary infection with Candida albicans after antibiotic therapy. The Candida infection is best described as:

Accepted Answer

A secondary infection

Question 12

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

Accepted Answer

The period characterized by early, mild symptoms such as general aches and malaise

Question 13

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

Accepted Answer

$$	ext{Morbidity rate} = \frac{	ext{number of people affected}}{	ext{total population in a given time period}}$$

Question 14

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

Accepted Answer

Shingles caused by varicella-zoster virus

Question 15

A mosquito transmits malaria by injecting Plasmodium into a human host. This is an example of:

Accepted Answer

Biological transmission by a vector

Question 16

Which of the following best describes the role of probiotics?

Accepted Answer

Live microbes applied to or ingested into the body to exert a beneficial effect

Question 17

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

Accepted Answer

Fever measured by a thermometer

Question 18

Which of the following is a method to control healthcare-associated infections (HAIs)?

Accepted Answer

Handwashing by healthcare workers

Question 19

A systemic infection that began as a local infection and then spread to other specific parts of the body is called:

Accepted Answer

Focal infection

Question 20

Which of the following is an example of a nonliving reservoir of infection?

Accepted Answer

Soil contaminated with Clostridium botulinum

Chapter 14-Principles of Disease and Epidemiology

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