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Questions and Answers
Which characteristic distinguishes Streptococcus pyogenes from other streptococcal bacteria?
Which characteristic distinguishes Streptococcus pyogenes from other streptococcal bacteria?
- Its beta-hemolytic activity, indicating complete lysis of red blood cells. (correct)
- Its ability to produce spores under adverse conditions.
- Its motility due to the presence of flagella.
- Its classification as a Gram-positive bacterium.
A patient presents with symptoms of pharyngitis, followed by a red, sandpaper-like rash. Which complication of the initial infection is most likely indicated by the rash?
A patient presents with symptoms of pharyngitis, followed by a red, sandpaper-like rash. Which complication of the initial infection is most likely indicated by the rash?
- Rheumatic heart disease.
- Scarlet fever. (correct)
- Acute glomerulonephritis.
- Necrotizing fasciitis.
What immunological process is most closely associated with the development of acute rheumatic fever following a Streptococcus pyogenes infection?
What immunological process is most closely associated with the development of acute rheumatic fever following a Streptococcus pyogenes infection?
- Exotoxin-mediated damage to the heart valves.
- Type II hypersensitivity reaction involving molecular mimicry. (correct)
- Deposition of immune complexes in the kidneys.
- Direct bacterial invasion of the heart tissue.
In a patient diagnosed with necrotizing fasciitis caused by Streptococcus pyogenes, what virulence factor is primarily responsible for the rapid tissue destruction?
In a patient diagnosed with necrotizing fasciitis caused by Streptococcus pyogenes, what virulence factor is primarily responsible for the rapid tissue destruction?
Following a bout of streptococcal pharyngitis, a child develops edema, hematuria, and hypertension. Which of the following pathological processes is most likely responsible for these clinical signs?
Following a bout of streptococcal pharyngitis, a child develops edema, hematuria, and hypertension. Which of the following pathological processes is most likely responsible for these clinical signs?
Flashcards
Streptococci
Streptococci
Non-motile, non-spore-forming, spherical bacteria.
Beta-hemolytic streptococci
Beta-hemolytic streptococci
Destroys red blood cells completely around colonies in culture.
S. pyogenes (Group A Streptococcus)
S. pyogenes (Group A Streptococcus)
A beta-hemolytic streptococcus; leading cause of strep throat.
Streptococcal Pharyngitis (Strep Throat)
Streptococcal Pharyngitis (Strep Throat)
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Necrotizing Fasciitis
Necrotizing Fasciitis
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Study Notes
- Streptococci are non-motile, non-spore-producing, spherical bacteria.
- They cause scarlet fever, rheumatic heart disease, glomerulonephritis, and pneumococcal pneumonia.
Group A Streptococcus
- Includes S. pyogenes, a beta-hemolytic streptococci, which completely destroys blood cells.
- It is a leading cause of:
- Streptococcal pharyngitis ("strep throat")
- Acute rheumatic fever
- Scarlet fever
- Acute glomerulonephritis
- Necrotizing fasciitis
- Can also cause:
- Sinusitis
- Otitis
- Joint or bone infections
- Meningitis
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