Question 1

Which of the following best describes the role of normal microbiota in microbial antagonism?

Accepted Answer

They compete with pathogens for nutrients and space, inhibiting pathogen colonization.

Question 2

A hospital reports 50 new cases of a notifiable disease in one week. Which epidemiological term best describes this number?

Accepted Answer

Incidence

Question 3

Which of the following is an example of a zoonosis?

Accepted Answer

Rabies transmitted from a dog bite to a human

Question 4

A patient develops an infection after a surgical procedure in a hospital. This infection is best classified as:

Accepted Answer

Healthcare-associated (nosocomial) infection

Question 5

Which of the following is the correct sequence of the stages of infectious disease?

Accepted Answer

Incubation period $$\rightarrow$$ Prodromal period $$\rightarrow$$ Period of illness $$\rightarrow$$ Period of decline $$\rightarrow$$ Period of convalescence

Question 6

Which portal of entry is most commonly used by respiratory pathogens?

Accepted Answer

Mucous membranes of the respiratory tract

Question 7

A patient is infected with two different pathogens at the same time. This is best described as:

Accepted Answer

Mixed infection

Question 8

Which of the following best explains why notifiable diseases must be reported to health authorities?

Accepted Answer

To monitor disease trends and implement public health interventions

Question 9

Which of the following enzymes produced by bacteria helps them spread through host tissues by breaking down connective tissue?

Accepted Answer

Collagenase

Question 10

A patient is exposed to a pathogen but does not develop any symptoms. However, laboratory tests confirm the presence of the pathogen. This is an example of:

Accepted Answer

Subclinical infection

Question 11

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

Accepted Answer

Incidence measures new cases over a period of time, while prevalence measures all existing cases at a specific time.

Question 12

A patient develops a secondary infection after being treated for influenza. Which of the following best describes the secondary infection?

Accepted Answer

An infection that occurs as a result of the weakened immune system from the primary infection

Question 13

Which of the following is a key function of the Morbidity and Mortality Weekly Report (MMWR)?

Accepted Answer

It publishes data on notifiable diseases to inform public health decisions.

Question 14

A bacterium produces coagulase. What is the likely effect of this enzyme on the host?

Accepted Answer

It causes clotting of blood, protecting the bacteria from host defenses.

Question 15

Which of the following best describes a nosocomial infection?

Accepted Answer

An infection acquired in a healthcare setting

Question 16

A patient is bitten by a cat and develops an infection. Which term best describes the source of this infection?

Accepted Answer

Zoonosis

Question 17

Which of the following is a common portal of entry for pathogens that cause gastrointestinal diseases?

Accepted Answer

Mucous membranes of the gastrointestinal tract

Question 18

A patient is infected with a pathogen that remains dormant in the body and can reactivate later. This is best described as:

Accepted Answer

Latent infection

Question 19

Which of the following best explains why hand hygiene is critical in preventing healthcare-associated infections (HAIs)?

Accepted Answer

It interrupts the transmission of pathogens between patients and healthcare workers.

Question 20

A patient with a compromised immune system is more likely to develop which type of infection?

Accepted Answer

Opportunistic infection

Infection, Infectious Disease, and Epidemiology – Chapter 14 Study Notes

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