Question 1

A patient is diagnosed with a disease that is constantly present at a low level in a specific geographic region. Which term best describes this pattern of disease occurrence?

Accepted Answer

Endemic disease

Question 2

Which of the following best describes the difference between signs and symptoms of a disease?

Accepted Answer

Signs are objective changes observed by others; symptoms are subjective changes felt by the patient.

Question 3

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

Accepted Answer

A nosocomial infection

Question 4

Which of the following is an example of mutualism?

Accepted Answer

E. coli in the human intestine synthesizing vitamin K for the host while receiving nutrients

Question 5

Which of the following best describes the term 'incidence' in epidemiology?

Accepted Answer

The number of new cases of a disease in a population during a specific time period

Question 6

A patient is infected with a virus that remains dormant in nerve cells and can reactivate years later. This type of infection is best described as:

Accepted Answer

Latent infection

Question 7

Which of the following is NOT a step in Koch’s postulates?

Accepted Answer

The microorganism must be found in all healthy individuals.

Question 8

A disease that spreads rapidly to many people in a given area in a short time is best described as:

Accepted Answer

Epidemic

Question 9

Which of the following best describes a fomite?

Accepted Answer

An inanimate object that can transmit infectious agents

Question 10

Which of the following is a major factor contributing to the emergence of new infectious diseases?

Accepted Answer

Global travel and trade

Question 11

A patient with HIV develops pneumonia caused by Pneumocystis jirovecii. The pneumonia is best described as:

Accepted Answer

A secondary infection

Question 12

Which of the following best describes the lytic cycle of a bacteriophage?

Accepted Answer

The phage causes immediate lysis and death of the host cell

Question 13

Which of the following is a characteristic that distinguishes viruses from bacteria?

Accepted Answer

Viruses are obligate intracellular parasites

Question 14

A disease that is easily spread from one person to another is best described as:

Accepted Answer

A contagious disease

Question 15

Which of the following best describes herd immunity?

Accepted Answer

Immunity in most of a population that reduces the spread of disease

Question 16

A researcher is studying the number of deaths caused by influenza in a population over a year. Which rate is being measured?

Accepted Answer

Mortality rate

Question 17

Which of the following is an example of microbial antagonism?

Accepted Answer

Normal microbiota outcompeting pathogens for nutrients on the skin

Question 18

A patient is exposed to a pathogen but does not develop any noticeable illness. This is best described as:

Accepted Answer

A subclinical infection

Question 19

Which of the following is a correct sequence of the stages of disease development?

Accepted Answer

Incubation period → Prodromal period → Period of illness → Period of decline → Period of convalescence

Question 20

A virus infects a bacterial cell and its DNA integrates into the host genome, remaining dormant. What is the integrated viral DNA called?

Accepted Answer

Prophage

Principles of Disease, Epidemiology, and Viruses: Study Guide

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