$$\frac{\text{Number of new cases during a period}}{\text{Population at risk during the same period}}$$

Question 1

Which of the following best describes the relationship in commensalism?

Accepted Answer

One organism benefits while the other is unaffected.

Question 2

A patient contracts influenza after visiting a crowded hospital waiting room. Which type of disease transmission does this scenario best illustrate?

Accepted Answer

Direct transmission via droplet

Question 3

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

Accepted Answer

$$\frac{	ext{Number of new cases during a period}}{	ext{Population at risk during the same period}}$$

Question 4

Which of the following is NOT a characteristic of a communicable disease?

Accepted Answer

It is always caused by bacteria.

Question 5

A researcher is studying the total number of cases of tuberculosis in a city over a year. Which epidemiological measure is being used?

Accepted Answer

Prevalence

Question 6

Which of the following best describes a nosocomial infection?

Accepted Answer

An infection acquired in a healthcare facility

Question 7

Which of the following is an example of mutualism?

Accepted Answer

E. coli synthesizing vitamins in the human intestine while benefiting from nutrients

Question 8

Which of the following is the correct sequence of stages in the development of an infectious disease?

Accepted Answer

Incubation period → Prodromal period → Period of illness → Period of decline → Period of convalescence

Question 9

Which of the following is a correct definition of Koch's postulates?

Accepted Answer

A set of criteria used to prove that a specific microorganism causes a specific disease

Question 10

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

Accepted Answer

Endemic

Question 11

Which of the following is a zoonosis?

Accepted Answer

Lyme disease transmitted from animals to humans

Question 12

Which of the following is a major function of the Centers for Disease Control and Prevention (CDC)?

Accepted Answer

Tracking occurrence of diseases and reporting statistics

Question 13

Which of the following is the correct formula for calculating mortality rate?

Accepted Answer

$$\frac{	ext{Number of deaths from a disease}}{	ext{Total population in a given time}}$$

Question 14

Which of the following best describes an analytical epidemiological study?

Accepted Answer

It analyzes probable causes, mode of transmission, and methods of prevention.

Question 15

A patient is diagnosed with a latent infection. Which of the following best describes this condition?

Accepted Answer

The patient has periods with no symptoms while the causative agent is inactive.

Question 16

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

Accepted Answer

A person touches a contaminated doorknob and then touches their mouth.

Question 17

Which of the following is a common misconception about noncommunicable diseases?

Accepted Answer

They are always caused by genetic factors.

Question 18

Which of the following is a correct example of a fomite?

Accepted Answer

A contaminated syringe transmitting hepatitis B

Question 19

Which of the following best describes herd immunity?

Accepted Answer

Immunity that results when a critical portion of a population is immune to a disease

Question 20

Which of the following is a key difference between experimental and descriptive epidemiology?

Accepted Answer

Experimental epidemiology tests hypotheses, while descriptive epidemiology collects data about cases.

Principles of Disease and Epidemiology: Microbiology Study Notes 14

Study Guide - Practice Questions