Question 1

Which of the following best describes septicemia?

Accepted Answer

A condition where bacteria multiply in the blood, often leading to severe systemic symptoms.

Question 2

Which of the following is a key difference between gram-negative and gram-positive sepsis?

Accepted Answer

Gram-negative sepsis is often associated with endotoxin release, while gram-positive sepsis is more commonly linked to exotoxin production.

Question 3

A patient presents with inflammation of the inner lining of the heart. What is the most likely diagnosis?

Accepted Answer

Endocarditis

Question 4

Brucellosis is also known as undulant fever because:

Accepted Answer

The fever rises and falls in a wave-like pattern.

Question 5

Which bacterial genus is responsible for causing Brucellosis, and how is it most commonly transmitted to humans?

Accepted Answer

Brucella; transmitted through unpasteurized dairy products or direct contact with infected animals.

Question 6

Which bacterial species is the causative agent of anthrax, and what is a common route of transmission to humans?

Accepted Answer

Bacillus anthracis; transmission often occurs through contact with contaminated animal products or inhalation of spores.

Question 7

Gas gangrene is most commonly caused by which bacterial species?

Accepted Answer

Clostridium perfringens

Question 8

A child is scratched by a cat and develops swollen lymph nodes near the scratch. Which bacterial species is most likely responsible?

Accepted Answer

Bartonella henselae

Question 9

The Black Death, which killed millions in Europe during the 14th century, was caused by which organism and transmitted in what way?

Accepted Answer

Yersinia pestis; transmitted by fleas from infected rodents.

Question 10

Lyme disease is caused by which bacterial species, and what is the primary vector for its transmission?

Accepted Answer

Borrelia burgdorferi; transmitted by Ixodes ticks.

Question 11

Which region of the United States has the highest incidence of Lyme disease?

Accepted Answer

Northeastern United States

Question 12

A college student is diagnosed with infectious mononucleosis. Which virus is the most likely cause, and how is it typically transmitted?

Accepted Answer

Epstein-Barr virus; transmitted through saliva.

Question 13

Which of the following best describes the effect of Ebolavirus on the human body?

Accepted Answer

It causes severe hemorrhagic fever, leading to internal and external bleeding.

Question 14

Toxoplasmosis is caused by which organism, and what kingdom does it belong to?

Accepted Answer

Toxoplasma gondii; Kingdom Protista (Protozoa)

Question 15

How are cats involved in the life cycle of Toxoplasma gondii?

Accepted Answer

Cats are the definitive host, shedding oocysts in their feces.

Question 16

Malaria is caused by which type of organism, and how is it transmitted?

Accepted Answer

A protozoan (Plasmodium species); transmitted by Anopheles mosquitoes.

Question 17

A patient develops sepsis after a urinary tract infection. Which of the following best explains why gram-negative sepsis can rapidly progress to septic shock?

Accepted Answer

Endotoxins released from gram-negative bacteria trigger a strong inflammatory response, leading to a rapid drop in blood pressure.

Question 18

Which of the following best defines lymphangitis?

Accepted Answer

Inflammation of the lymphatic vessels, often visible as red streaks under the skin.

Question 19

A patient presents with chest pain and inflammation of the sac surrounding the heart. What is the most likely diagnosis?

Accepted Answer

Pericarditis

Question 20

A traveler to sub-Saharan Africa develops fever, chills, and anemia. Blood smears reveal ring-shaped parasites inside red blood cells. Which disease is most likely, and what is the causative agent?

Accepted Answer

Malaria; caused by Plasmodium species

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