Question 1

Which of the following best illustrates mutualism in a symbiotic relationship?

Accepted Answer

Oxpecker birds eating parasites off a rhino

Question 2

A patient develops a yeast infection after taking broad-spectrum antibiotics for several weeks. Which of the following best explains why this occurred?

Accepted Answer

The antibiotics disrupted the normal microbiota, allowing opportunistic pathogens to overgrow

Question 3

Which of the following is an example of vehicle transmission of a pathogen?

Accepted Answer

Drinking water contaminated with sewage

Question 4

Which stage of an infectious disease is characterized by the most severe signs and symptoms?

Accepted Answer

Illness stage

Question 5

A person with a weakened immune system develops pneumonia from bacteria that are normally harmless in the throat. This is an example of:

Accepted Answer

A commensal organism becoming an opportunistic pathogen

Question 6

Which of the following is a sign, rather than a symptom, of disease?

Accepted Answer

Fever

Question 7

After the 2010 earthquake in Haiti, over 470,000 cases of cholera were reported. What was the most likely mode of transmission?

Accepted Answer

Waterborne vehicle transmission

Question 8

Koch's postulates are used to:

Accepted Answer

Demonstrate the relationship between a specific microorganism and a specific disease

Question 9

Which of the following correctly lists the sequence of stages in the disease process?

Accepted Answer

Incubation, Prodromal, Illness, Decline, Convalescence

Question 10

A person frequently washes their hands during cold season and has fewer colds. This suggests that cold viruses are most likely transmitted by:

Accepted Answer

Direct or indirect contact transmission

Question 11

Which of the following best defines a pathogen?

Accepted Answer

Any microorganism or agent that causes disease in a host

Question 12

A new influenza strain is spreading rapidly. Which of the following is NOT a recommended public health measure to control its spread?

Accepted Answer

Encouraging people to avoid all vaccinations

Question 13

Which of the following best describes commensalism?

Accepted Answer

One organism benefits, the other is neither harmed nor helped

Question 14

Which of the following is the best example of parasitism?

Accepted Answer

Tapeworms living in the intestines of a mammal

Question 15

A reservoir is best defined as:

Accepted Answer

The primary habitat or source in the natural world where a pathogen normally lives, grows, and multiplies

Question 16

A patient presents with fever, rash, and high blood pressure. Which of the following are considered signs of disease?

Accepted Answer

Fever, rash, and high blood pressure

Question 17

Which of the following scenarios best demonstrates how a commensal organism can become an opportunistic pathogen?

Accepted Answer

E. coli from the gut enters the urinary tract and causes infection

Question 18

Which of the following is a correct statement about the prodromal period of an infectious disease?

Accepted Answer

It is characterized by vague, general symptoms

Question 19

A patient is exposed to a pathogen but does not yet show any signs or symptoms. Which stage of the disease process is this?

Accepted Answer

Incubation period

Question 20

Which of the following best describes the relationship between the Satchmo fish and sharks?

Accepted Answer

Commensalism

Infection, Infectious Diseases, and Epidemiology: Key Concepts and Review

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