Question 1

Which of the following best describes the contribution of Ignaz Semmelweis to the field of epidemiology?

Accepted Answer

He demonstrated that handwashing with disinfectant drastically reduced the incidence of puerperal fever in hospitals.

Question 2

A hospital experiences an outbreak of a gastrointestinal illness. Epidemiologists determine that the attack rate is 25% in a population of 400 patients. How many patients became ill?

Accepted Answer

$$100$$

Question 3

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

Accepted Answer

Tetanus caused by Clostridium tetani

Question 4

Which of the following best defines 'prevalence' in epidemiology?

Accepted Answer

The total number of cases (old and new) at any time or over a specific period in a given population.

Question 5

A disease that is constantly present in a population, such as the common cold in the United States, is referred to as:

Accepted Answer

Endemic

Question 6

Which of the following is a correct example of vertical transmission?

Accepted Answer

A pregnant woman transmits HIV to her fetus during childbirth.

Question 7

Which of the following is the most effective single measure for preventing the spread of infectious diseases in healthcare settings?

Accepted Answer

Handwashing

Question 8

A propagated epidemic is characterized by:

Accepted Answer

A slow rise in cases, indicating person-to-person transmission.

Question 9

Which of the following is an example of a zoonosis?

Accepted Answer

Rabies

Question 10

A patient develops a bloodstream infection after insertion of a contaminated intravenous catheter. This is an example of:

Accepted Answer

Fomite transmission via a medical device

Question 11

Which of the following factors would most likely increase the risk of an epidemic in a population?

Accepted Answer

Low general health and poor sanitation

Question 12

Which of the following statements about the case-fatality rate is correct?

Accepted Answer

It is the percentage of the population that dies from a specific disease.

Question 13

Which of the following is a function of the World Health Organization (WHO)?

Accepted Answer

Providing worldwide guidance in the field of health

Question 14

A new strain of Vibrio cholerae acquires the ability to produce a capsule, making it more virulent. This is an example of:

Accepted Answer

Microbial evolution

Question 15

Which of the following best explains why Clostridium species are difficult to eliminate from the environment?

Accepted Answer

They form spores that survive in soil and water.

Question 16

A cross-sectional study in epidemiology is best described as:

Accepted Answer

A survey of a range of people at a single point in time to suggest associations between risk factors and disease.

Question 17

Which of the following is a common source of healthcare-associated infections (HAIs)?

Accepted Answer

Patient's own microbiota introduced by invasive procedures

Question 18

Which of the following best describes herd immunity?

Accepted Answer

Protection of non-immune individuals in a population when a high percentage is immune.

Question 19

A city of 200,000 people reports 500 new cases of a disease in one year. What is the incidence rate per 100,000 people per year?

Accepted Answer

$$250$$

Question 20

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

Accepted Answer

A fly carrying bacteria on its legs from feces to food.

Principles of Epidemiology in Microbiology

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