Microbiology Scenarios Gram-Positive Bacteria

Which Gram-positive bacteria is known for causing MRSA infections and can lead to conditions like toxic shock syndrome and food poisoning?

Staphylococcus aureus

Which Gram-positive bacteria is commonly associated with prosthetic infections and is known for biofilm formation?

Staphylococcus epidermidis

Which Gram-positive bacteria is a common cause of urinary tract infections (UTIs) in sexually active young women?

Staphylococcus saprophyticus

Which Gram-positive bacteria is responsible for strep throat, scarlet fever, and necrotizing fasciitis?

Streptococcus pyogenes

Which Gram-positive bacteria is a leading cause of neonatal sepsis and meningitis?

Streptococcus agalactiae

Which Gram-positive bacteria commonly causes pneumonia, meningitis, and sinusitis?

Streptococcus pneumoniae

Which Gram-positive bacteria is responsible for dental caries (cavities)?

Streptococcus mutans

Which Gram-positive bacteria is known for causing antibiotic-resistant UTIs?

Enterococcus faecalis

Bacillus anthracis

Which Gram-positive bacteria causes cutaneous and pulmonary anthrax?

Which Gram-positive bacteria is linked to food poisoning from contaminated rice?

Bacillus cereus

Which Gram-positive bacteria produces a toxin that causes tetanus?

Clostridium tetani

Which Gram-positive bacteria is responsible for botulism, commonly linked to contaminated canned goods?

Clostridium botulinum

Which Gram-positive bacteria is associated with gas gangrene and rapid tissue destruction?

Clostridium perfringens

Which Gram-positive bacteria causes antibiotic-associated colitis (AAPC)?

Clostridioides difficile

Which Gram-positive bacteria causes diphtheria and produces a thick membrane in the throat?

Corynebacterium diphtheriae

Which Gram-positive bacteria is responsible for acne?

Propionibacterium acnes

Which Gram-positive bacteria can cross the placenta and cause meningitis in newborns?

Listeria monocytogenes

Which Gram-positive bacteria is responsible for tuberculosis and is detected via the PPD skin test?

Mycobacterium tuberculosis

Which Gram-positive bacteria causes leprosy and is detected via the lepromin skin test?

Mycobacterium leprae

Question: A patient presents with food poisoning after eating rice that was left out overnight. Which of the following bacteria is most likely the cause?

Bacillus cereus

An elderly patient in a nursing home develops pneumonia with high fever and difficulty breathing. Which of the following bacteria is the most likely cause?

Streptococcus pneumoniae

A newborn experiences respiratory distress and fever shortly after birth. Which of the following bacteria is the most likely cause?

Streptococcus agalactiae

Question: A construction worker steps on a nail and later develops muscle spasms and lockjaw. Which of the following bacteria is most likely responsible?

Clostridium tetani

A patient presents with severe diarrhea after taking antibiotics for an unrelated infection. Which of the following bacteria is the most likely cause?

A) Clostridioides difficile
B) Propionibacterium acnes
C) Bacillus anthracis
Answer: Clostridioides difficile