Question 1

Which type of symbiotic relationship is characterized by one organism benefiting while the other is neither helped nor harmed?

Accepted Answer

Commensalism

Question 2

A patient develops an infection after surgery in a hospital. The pathogen is resistant to multiple antibiotics. What type of infection is this, and what is a key strategy to reduce its occurrence?

Accepted Answer

Nosocomial infection; handwashing and disinfecting equipment

Question 3

Which of the following best describes a zoonosis?

Accepted Answer

A disease caused by pathogens transmitted from animals to humans

Question 4

What is the main difference between resident and transient microbiota?

Accepted Answer

Resident microbiota persist throughout life, while transient microbiota remain for a short period.

Question 5

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

Accepted Answer

The pathogen must be able to infect any host regardless of susceptibility.

Question 6

A disease that is easily and rapidly spread from one host to another is best described as:

Accepted Answer

Contagious

Question 7

Which of the following is a measure of disease burden that takes into account both life quality and productivity?

Accepted Answer

DALY (disability-adjusted life year)

Question 8

If a disease has a high basic reproduction number ($$R_0$$), what must be true about the percentage of individuals immune to the pathogen to achieve herd immunity?

Accepted Answer

A higher percentage of immune individuals is required.

Question 9

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

Accepted Answer

Incidence is the number of new cases over a period, prevalence is the total number of cases (new + old) over a period.

Question 10

A disease outbreak occurs suddenly in a specific geographical location. What is this called?

Accepted Answer

Outbreak

Question 11

Which mode of transmission involves pathogens entering the body from non-living sources such as water, food, or soil?

Accepted Answer

Vehicle transmission

Question 12

In the graph provided, which epidemic type is characterized by a rapid rise and fall in disease incidence, and what is a typical example?

Accepted Answer

Common-source epidemic; cholera

Question 13

Which of the following is an example of a mechanical vector?

Accepted Answer

A fly carrying bacteria on its legs from feces to food without the pathogen colonizing the fly

Question 14

Which stage of disease is characterized by mild presentation of signs and symptoms?

Accepted Answer

Prodromal period

Question 15

Which field of epidemiology involves collection and analysis of data to describe disease occurrence?

Accepted Answer

Descriptive epidemiology

Question 16

A disease that is not spread from one host to another is classified as:

Accepted Answer

Noncommunicable

Question 17

Which of the following factors can contribute to the emergence or reemergence of infectious diseases?

Accepted Answer

Genetic recombination

Question 18

What is the term for the cause of a disease, especially in the context of infectious diseases?

Accepted Answer

Etiology

Question 19

If a chronic disease has a constant incidence, what happens to its prevalence over time?

Accepted Answer

Prevalence increases

Question 20

Which of the following best describes herd immunity?

Accepted Answer

Resistant individuals prevent outbreaks by reducing the number of susceptible hosts

Epidemiology and Patterns of Infectious Disease

Study Guide - Practice Questions

Study Guide - Flashcards