Q: Which of the following equations correctly represents the attack rate?

$$\text{Attack Rate} = \frac{\text{Number of cases among exposed}}{\text{Number of people exposed}} \times 100$$

Question 1

Which of the following best describes the difference between incidence and prevalence in epidemiology?

Accepted Answer

Incidence is the number of new cases per specific time period, while prevalence is the total number of existing cases.

Question 2

A hospital patient develops a urinary tract infection after catheterization. This infection is best classified as:

Accepted Answer

A nosocomial infection

Question 3

Which of the following is an example of vertical transmission?

Accepted Answer

A mother transmits HIV to her baby during breastfeeding.

Question 4

Which of the following is the most effective way to prevent direct contact transmission of pathogens in a hospital setting?

Accepted Answer

Handwashing between patient contacts

Question 5

A rapid rise in the number of cases of a disease in a population suggests which type of epidemic?

Accepted Answer

Common source epidemic

Question 6

Which of the following is a major portal of entry for pathogens, as shown in the provided diagram?

Accepted Answer

Digestive tract

Question 7

A disease that is constantly present in a population is referred to as:

Accepted Answer

Endemic

Question 8

Which of the following is a common reservoir for zoonotic diseases?

Accepted Answer

Non-human animals

Question 9

Which of the following equations correctly represents the attack rate?

Accepted Answer

$$	ext{Attack Rate} = \frac{	ext{Number of cases among exposed}}{	ext{Number of people exposed}} 	imes 100$$

Question 10

Which of the following factors is LEAST likely to contribute to the emergence or reemergence of infectious diseases?

Accepted Answer

Improved sanitation

Question 11

A pie chart shows that 39% of nosocomial infections are urinary tract infections. If a hospital reports 200 nosocomial infections in a year, how many are expected to be urinary tract infections?

Accepted Answer

$$200 	imes 0.39 = 78$$

Question 12

Which of the following is NOT a function of the World Health Organization (WHO)?

Accepted Answer

Mandating which diseases are reportable in each US state

Question 13

Which of the following best describes herd immunity?

Accepted Answer

Protection of unimmunized individuals due to a high proportion of immune individuals in the population

Question 14

A patient develops pneumonia after being on a mechanical respirator in the hospital. Which of the following is the most likely source of the pathogen?

Accepted Answer

Medical device breaching first-line barriers

Question 15

Which of the following is the best example of indirect contact transmission?

Accepted Answer

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

Question 16

Which of the following is a key reason why waterborne disease outbreaks can affect large numbers of people?

Accepted Answer

Municipal water is distributed to large areas.

Question 17

Which of the following is the most important step in preventing nosocomial infections?

Accepted Answer

Recognizing their occurrence and establishing prevention policies

Question 18

Which of the following best describes a propagated epidemic?

Accepted Answer

A gradual rise in cases due to person-to-person transmission

Question 19

Which of the following is a plausible reason why elderly individuals are at greater risk for infectious diseases?

Accepted Answer

Their immune system is waning with age.

Question 20

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

Accepted Answer

$$	ext{Morbidity Rate} = \frac{	ext{Number of cases of illness}}{	ext{Population at risk}} 	imes 100$$

Principles of Epidemiology and Nosocomial Infections: Study Notes

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