Question 1

Which of the following best describes the relationship between termites and the protozoa in their gut, as shown in the first image?

Accepted Answer

Mutualism, because both the termite and protozoa benefit from the relationship.

Question 2

Which of the following is NOT a way that normal microbiota can become opportunistic pathogens?

Accepted Answer

Increased abundance of normal microbiota.

Question 3

A patient develops a bacterial infection after a surgical procedure. According to the categories of disease, this infection is best classified as:

Accepted Answer

Iatrogenic infection

Question 4

Which of the following statements about exotoxins and endotoxins is correct?

Accepted Answer

Exotoxins are proteins with high toxicity, while endotoxins are lipids with lower toxicity.

Question 5

A newborn is found to have a severe infection caused by Listeria monocytogenes. Which portal of entry is most likely responsible for this infection?

Accepted Answer

Placenta

Question 6

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

Accepted Answer

Incidence is the number of new cases over a period; prevalence is the total number of cases at a given time.

Question 7

A patient is infected with a pathogen that produces a capsule. What is the primary function of this capsule as a virulence factor?

Accepted Answer

To prevent recognition and phagocytosis by host immune cells.

Question 8

Which of the following scenarios best illustrates zoonosis?

Accepted Answer

A person contracts rabies after being bitten by a dog.

Question 9

Which of the following is an example of vehicle transmission of a pathogen?

Accepted Answer

A person develops cholera after drinking contaminated water.

Question 10

A disease that is constantly present at a low level in a specific geographic area is best described as:

Accepted Answer

Endemic

Question 11

Which of the following best explains why handwashing is considered the most effective way to reduce healthcare-associated infections?

Accepted Answer

It removes transient microbiota that may be pathogenic.

Question 12

A patient presents with symptoms and signs that are characteristic of a specific disease. This collection of symptoms and signs is referred to as a:

Accepted Answer

Syndrome

Question 13

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

Accepted Answer

A pathogen must be isolated and grown in pure culture, then cause disease when introduced into a healthy host.

Question 14

Which of the following is a limitation of Koch's postulates?

Accepted Answer

They cannot be applied to diseases caused by more than one pathogen.

Question 15

A patient is exposed to a pathogen but does not develop any symptoms, although laboratory tests reveal the presence of the pathogen. This type of infection is best described as:

Accepted Answer

Asymptomatic (subclinical) infection

Question 16

Which of the following best describes the parenteral route of pathogen entry?

Accepted Answer

Entry through the skin or mucous membranes via cuts, bites, or injections.

Question 17

A patient develops a secondary infection after antibiotic treatment for a primary infection. This is most likely due to:

Accepted Answer

The antibiotics inhibiting some resident microbiota, allowing other microbes to thrive.

Question 18

Which of the following is an example of analytical epidemiology?

Accepted Answer

Investigating the probable cause and mode of transmission of a disease outbreak after it has occurred.

Question 19

Which of the following is a correct statement about the acquisition of normal microbiota?

Accepted Answer

Most resident microbiota are acquired during the first months of life, especially during the birthing process.

Question 20

Which of the following best describes the function of adhesion factors in microbial pathogenesis?

Accepted Answer

They enable microorganisms to attach to host cells and establish colonies.

Infection, Infectious Diseases, and Epidemiology: Structured Study Notes

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