Question 1

Which of the following is the most common cause of bacterial meningitis in adults, and what is the primary route of transmission?

Accepted Answer

Streptococcus pneumoniae; respiratory droplets

Question 2

A patient presents with a rice-water stool and severe dehydration after traveling to a region with poor sanitation. Which pathogen is most likely responsible, and what is the recommended initial treatment?

Accepted Answer

Vibrio cholerae; oral rehydration therapy

Question 3

Which skin infection is characterized by exfoliative toxins causing widespread blistering and peeling, and is most commonly seen in infants?

Accepted Answer

Staphylococcal scalded skin syndrome (SSSS)

Question 4

A patient develops flaccid paralysis after consuming home-canned food. Which organism is responsible, and what is the mechanism of paralysis?

Accepted Answer

Clostridium botulinum; inhibition of acetylcholine release at neuromuscular junctions

Question 5

Which of the following best describes the difference between acute and subacute endocarditis?

Accepted Answer

Acute endocarditis is rapid and often caused by Staphylococcus aureus, while subacute endocarditis develops slowly and is associated with biofilm formation on previously damaged valves.

Question 6

A child presents with a sandpaper-like rash and a strawberry tongue. Which pathogen is most likely responsible, and what is the associated toxin?

Accepted Answer

Streptococcus pyogenes; erythrogenic toxin

Question 7

Which of the following is a major complication of untreated gonorrhea in women, and what is the primary causative agent?

Accepted Answer

Pelvic inflammatory disease; Neisseria gonorrhoeae

Question 8

Which of the following pathogens is most commonly associated with pseudomembranous colitis following antibiotic therapy?

Accepted Answer

Clostridioides difficile

Question 9

A patient presents with fever, headache, and a bullseye rash after hiking in a wooded area. Which disease is most likely, and what is the vector?

Accepted Answer

Lyme disease; Ixodes tick

Question 10

Which of the following statements about urinary tract infections (UTIs) is correct?

Accepted Answer

Escherichia coli is the most common cause of community-acquired UTIs.

Question 11

Which virus is the leading cause of viral gastroenteritis in children worldwide?

Accepted Answer

Rotavirus

Question 12

A patient with a history of antibiotic use develops severe diarrhea and is found to have pseudomembranes in the colon. What is the most likely diagnosis and causative agent?

Accepted Answer

Pseudomembranous colitis; Clostridioides difficile

Question 13

Which of the following is a key feature of Escherichia coli O157:H7 infection?

Accepted Answer

Bloody diarrhea with no antibiotics recommended

Question 14

Which of the following pathogens is most commonly associated with the development of Guillain-Barré syndrome after infection?

Accepted Answer

Campylobacter jejuni

Question 15

A patient presents with fever, chills, and a black eschar after being bitten by a flea. Which disease is most likely, and what is the causative agent?

Accepted Answer

Plague; Yersinia pestis

Question 16

Which of the following is the most common cause of pneumonia in adults, and what is the typical presentation?

Accepted Answer

Streptococcus pneumoniae; sudden onset of fever, productive cough, and chest pain

Question 17

Which of the following statements about HPV and cervical cancer is correct?

Accepted Answer

HPV types 16 and 18 are most strongly associated with cervical cancer.

Question 18

A patient presents with fever and chills after returning from a trip to Africa. Blood smear shows ring forms inside red blood cells. Which disease is most likely, and what is the causative agent?

Accepted Answer

Malaria; Plasmodium falciparum

Question 19

Which of the following is the best definition of septicemia?

Accepted Answer

Bacteria growing in the bloodstream

Question 20

Which of the following is the most common cause of acute pharyngitis in children, and what is a potential complication if left untreated?

Accepted Answer

Streptococcus pyogenes; rheumatic fever

Microbiology Study Guide: Infectious Diseases by Body System

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