$Prevalence = Incidence \times Duration$

Question 1

Which of the following best describes the role of portals of entry in the infectious disease process?

Accepted Answer

They are specific sites through which microbes gain access to the host, influencing colonization and infection.

Question 2

A patient develops a hospital-acquired infection (HAI) after surgery. Which of the following best describes this type of infection?

Accepted Answer

An infection that occurs during or after medical care in a healthcare facility.

Question 3

Which equation correctly represents the relationship between incidence, prevalence, and duration of a disease?

Accepted Answer

$Prevalence = Incidence 	imes Duration$

Question 4

Which of the following is NOT a characteristic of the second line of defense in innate immunity?

Accepted Answer

Physical barriers such as skin and mucous membranes.

Question 5

A child receives a vaccine for measles. Which type of immunity is primarily being developed?

Accepted Answer

Artificial active immunity

Question 6

Which of the following statements about MHC I and MHC II molecules is correct?

Accepted Answer

MHC I molecules present endogenous antigens to cytotoxic T cells.

Question 7

Which process is described by the movement of leukocytes out of the circulatory system towards the site of tissue damage or infection?

Accepted Answer

Diapedesis

Question 8

A patient with a deficiency in complement proteins would most likely experience which of the following?

Accepted Answer

Increased susceptibility to bacterial infections due to impaired lysis of pathogens.

Question 9

Which of the following is a correct example of a protozoan parasite and the disease it causes?

Accepted Answer

Trypanosoma brucei – African sleeping sickness

Question 10

Which of the following best describes herd immunity?

Accepted Answer

Protection of susceptible individuals when a large portion of the population is immune.

Question 11

Which of the following is a function of B cells in the adaptive immune response?

Accepted Answer

Production of antibodies

Question 12

A patient is diagnosed with Type I hypersensitivity. Which immunoglobulin class is primarily involved?

Accepted Answer

$IgE$

Question 13

Which of the following best describes the difference between endemic and epidemic patterns of infectious disease?

Accepted Answer

Endemic diseases are constantly present in a population, while epidemics involve a sudden increase in cases.

Question 14

Which of the following is an example of a physical barrier in the first line of defense?

Accepted Answer

Skin

Question 15

Which of the following best describes the role of superantigens in the immune response?

Accepted Answer

They cause massive activation of T cells, leading to toxic shock syndrome.

Question 16

Which of the following is a correct statement about the development of the human microbiome?

Accepted Answer

It develops through life and is influenced by factors such as diet and environment.

Question 17

Which of the following is a correct example of a prebiotic?

Accepted Answer

Non-digestible fibers that promote growth of beneficial microbes

Question 18

A patient with autoimmune disease produces antibodies against their own red blood cells. Which blood group system is most relevant in this scenario?

Accepted Answer

ABO blood group system

Question 19

Which of the following is a correct description of the direct life cycle of a protozoan parasite?

Accepted Answer

The parasite completes its development in a single host species.

Question 20

Which of the following is a correct example of artificial passive immunity?

Accepted Answer

Receiving antivenom after a snake bite

Comprehensive Study Notes: Microbe-Human Interactions, Immunity, Microbiome, and Parasitology

Study Guide - Practice Questions