Question 1

Which of the following best describes the relationship between humans and their resident microbiota?

Accepted Answer

A mutualistic symbiosis, where both humans and microbes benefit.

Question 2

Which of the following is NOT a function of the human microbiome?

Accepted Answer

Direct synthesis of human DNA.

Question 3

A patient develops a urinary tract infection after prolonged antibiotic therapy. Which condition most likely allowed normal microbiota to cause disease?

Accepted Answer

Disruption of normal microbiota by antibiotics.

Question 4

Which of the following is an example of a zoonotic reservoir?

Accepted Answer

Rabies virus in bats.

Question 5

Which portal of entry is most commonly associated with respiratory infections?

Accepted Answer

Mucous membranes of the respiratory tract.

Question 6

Which statement best distinguishes between infection and disease?

Accepted Answer

Infection is the invasion of the host by pathogens, while disease is the result of damage caused by the infection.

Question 7

A biofilm on a catheter increases the risk of infection primarily because:

Accepted Answer

Biofilms protect microbes from antibiotics and immune responses.

Question 8

Which of the following is NOT one of Koch's postulates?

Accepted Answer

The microorganism must be resistant to all antibiotics.

Question 9

Which virulence factor allows bacteria to evade phagocytosis?

Accepted Answer

Capsule formation.

Question 10

During which stage of infectious disease is a patient most likely to be contagious, even if symptoms are not present?

Accepted Answer

Incubation period.

Question 11

Which mode of transmission involves an inanimate object transferring pathogens between hosts?

Accepted Answer

Indirect contact transmission via a fomite.

Question 12

Which of the following best describes the difference between droplet and airborne transmission?

Accepted Answer

Droplet transmission involves larger particles that travel short distances; airborne transmission involves smaller particles that remain suspended and travel longer distances.

Question 13

Which of the following is an example of a chronic disease?

Accepted Answer

Tuberculosis persisting for years.

Question 14

Which of the following is a communicable infectious disease?

Accepted Answer

Measles.

Question 15

Which factor is most likely to contribute to the emergence of a new infectious disease?

Accepted Answer

Global travel and migration.

Question 16

Epidemiology is best defined as:

Accepted Answer

The study of the distribution and determinants of health-related states in populations.

Question 17

Given the following data: In a city of 100,000 people, 500 new cases of hepatitis B are reported in one year, and there are 2,000 total cases at the end of the year. What is the incidence rate?

Accepted Answer

$\frac{500}{100,000} = 0.005$ or $0.5\%$

Question 18

Which of the following best describes a pandemic?

Accepted Answer

An infectious disease that spreads across multiple continents or worldwide.

Question 19

Which of the following is NOT a core function of public health?

Accepted Answer

Profit maximization.

Question 20

A patient acquires a surgical site infection in a hospital. Which factor most likely contributed to this nosocomial infection?

Accepted Answer

Inadequate sterilization of surgical instruments.

Principles of Disease and Epidemiology: Study Guide Notes

Study Guide - Practice Questions

Study Guide - Flashcards