Question 1

Which of the following best distinguishes an opportunistic pathogen from a true pathogen?

Accepted Answer

An opportunistic pathogen only causes disease in immunocompromised hosts, while a true pathogen can cause disease in healthy individuals.

Question 2

A patient develops a urinary tract infection after being catheterized in a hospital. Which term best describes the source of this infection?

Accepted Answer

Endogenous source

Question 3

Which of the following scenarios best illustrates indirect transmission of a disease?

Accepted Answer

A person contracts Salmonella after eating contaminated chicken.

Question 4

Which of the following is the correct sequence of stages in the course of an infectious disease?

Accepted Answer

Incubation period $$\rightarrow$$ prodromal period $$\rightarrow$$ acute period $$\rightarrow$$ period of decline $$\rightarrow$$ convalescent period

Question 5

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

Accepted Answer

Endemic

Question 6

Which of the following best describes the difference between a pandemic and an epidemic?

Accepted Answer

A pandemic affects multiple countries or continents, while an epidemic is limited to a specific region.

Question 7

Which of the following is NOT a standard precaution for preventing healthcare-acquired infections (HAIs)?

Accepted Answer

Administering antibiotics to all patients upon admission

Question 8

Which of the following is a common healthcare-acquired infection (HAI) pathogen?

Accepted Answer

Clostridioides difficile

Question 9

A disease is considered 'emerging' if:

Accepted Answer

It has recently increased in incidence or geographic range, or is newly identified.

Question 10

Which of the following best explains why healthcare settings are hot zones for antibiotic-resistant pathogens?

Accepted Answer

High antibiotic usage and close proximity of immunocompromised patients facilitate the selection and spread of resistant strains.

Question 11

Which of the following is the best example of a biological vector in disease transmission?

Accepted Answer

A mosquito transmitting Plasmodium species (malaria) to humans

Question 12

Which of the following statements about Koch’s postulates is correct?

Accepted Answer

They provide a systematic method to link a specific microorganism to a specific disease.

Question 13

A healthcare provider documents a reportable disease by:

Accepted Answer

Submitting a case report to the local or state health department, which then notifies the CDC.

Question 14

Which of the following best defines herd immunity?

Accepted Answer

When a high percentage of the population is immune, reducing the likelihood of disease spread.

Question 15

Which of the following is an example of a non-communicable disease?

Accepted Answer

Tetanus acquired from a puncture wound

Question 16

A patient is diagnosed with tuberculosis, which remains dormant in the body for years before causing symptoms. This is an example of:

Accepted Answer

Latent disease

Question 17

Which of the following is a correct statement about the CDC’s role in public health?

Accepted Answer

The CDC conducts surveillance, investigates outbreaks, and provides guidelines to prevent disease spread.

Question 18

In a disinfectant lab, a student tests the effectiveness of two disinfectants on bacterial cultures. Disinfectant A reduces colony count from 1000 to 10, while Disinfectant B reduces it from 1000 to 100. What is the log reduction for Disinfectant A?

Accepted Answer

Question 19

Which of the following factors is LEAST likely to contribute to the emergence or re-emergence of infectious diseases?

Accepted Answer

Increased vaccination coverage

Question 20

In an epidemiological investigation, the first documented patient in an outbreak is referred to as the:

Accepted Answer

Index case

Principles of Infectious Disease and Epidemiology: Study Guide Notes

Guida di studio - Domande di pratica

Study guide - Flashcard