Q: Which equation would you use to calculate the attack rate ($$AR) of a $$disease in a hospital setting?

$$AR = \frac{\text{Number of new cases}}{\text{Population at risk}} \times 100$$

Question 1

Which of the following best describes the concept of herd immunity?

Accepted Answer

A situation where a high proportion of individuals in a population are immune, thereby reducing the spread of contagious diseases and protecting those who are not immune.

Question 2

Based on the pie chart of nosocomial infection sites, which site is most commonly affected?

Accepted Answer

Urinary tract

Question 3

A patient develops a blue-green pus in a bedsore after prolonged hospitalization and antibiotic treatment. Which organism is most likely responsible?

Accepted Answer

Pseudomonas aeruginosa

Question 4

Which biosafety level (BSL) requires the use of suits with life support systems and is used for handling dangerous/exotic agents such as Ebola virus?

Accepted Answer

BSL-4

Question 5

Which equation best represents the relationship between the proportion of immune individuals ($$I) $$and the reduction in disease transmission ($$R) in a $$population?

Accepted Answer

$$R = (1 - I) 	imes T$$

Question 6

Which of the following is NOT a universal precaution recommended by the CDC for preventing nosocomial infections?

Accepted Answer

Reusing needles after sterilization.

Question 7

Which of the following diseases is NOT protected by herd immunity?

Accepted Answer

Tetanus

Question 8

A laboratory worker is handling Mycobacterium tuberculosis. Which biosafety level is required?

Accepted Answer

BSL-3

Question 9

Which of the following is a major reason for the elimination of smallpox worldwide?

Accepted Answer

Herd immunity achieved through widespread vaccination

Question 10

A country has reduced polio cases from 125 endemic countries in 1988 to only 3 in 2014. Which public health strategy contributed most to this reduction?

Accepted Answer

Immunization campaigns

Question 11

Which of the following is a characteristic of CDC Category A bioterrorism agents?

Accepted Answer

Person-to-person spread, high mortality rate, and potential for public panic

Question 12

A patient in septic shock is found to have gram-negative rods in blood cultures. What is the most likely cause of fever and shock?

Accepted Answer

Production of endotoxins

Question 13

Which of the following is the most effective method for preventing nosocomial infections in hospitals?

Accepted Answer

Handwashing by healthcare workers

Question 14

Which equation would you use to calculate the attack rate ($$AR) of a $$disease in a hospital setting?

Accepted Answer

$$AR = \frac{	ext{Number of new cases}}{	ext{Population at risk}} 	imes 100$$

Question 15

Which of the following is NOT a common source of nosocomial infections?

Accepted Answer

Vaccination

Question 16

Which of the following is a recommended lab safety practice for BSL-1 laboratories?

Accepted Answer

Working on open benchtops with standard microbiological practices

Question 17

Which of the following is a reason why nosocomial infections are often caused by normal flora?

Accepted Answer

Hospitalized patients are often immunosuppressed or have breaks in skin/mucous membranes.

Question 18

Which of the following is a key difference between isolation and quarantine?

Accepted Answer

Isolation separates infected individuals from the population, while quarantine separates healthy but exposed individuals during the incubation period.

Question 19

Which of the following is a vector control strategy for preventing disease transmission?

Accepted Answer

Eliminating standing water to reduce mosquito breeding

Question 20

Which of the following is a characteristic of CDC Category C bioterrorism agents?

Accepted Answer

Emerging pathogens that may be engineered for mass spread and are easy to produce/spread

Epidemiology and Control of Infectious Diseases: Herd Immunity, Transmission, and Nosocomial Infections

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