Streptococcus Pyogenes
Note: classically, erysipelas is most associated with Streptococcus pyogenes rather than S. aureus — worth clarifying this distinction with your lecturer, since the question specifically attributes both to S. aureus
What our notes say
- Note: classically, erysipelas is most associated with Streptococcus pyogenes rather than S. aureus — worth clarifying this distinction with your lecturer, since the question specifically attributes both to S. aureus (Bacteriology and Entomology Main Exam)
- Streptococcus pyogenes (group A beta-haemolytic) pharyngitis triggers the immune reaction. (Paediatrics end of second semester exam (MBPE 4300): 4 October 2022, cardiology,)
- Acute rheumatic fever follows a throat infection (pharyngitis or tonsillitis) with Lancefield group A beta-haemolytic streptococcus (Streptococcus pyogenes), 2 to 4 weeks earlier. (Paediatrics main exam (MBPE 4300): 24 January 2022, Paper One, 100 MCQs, 2 short)
- Beta (β) hemolysis: complete hemolysis, clear zone around colonies (e.g., Streptococcus pyogenes/Group A, Streptococcus agalactiae/Group (Bacteriology and Entomology Supplementary Exam)
- STREPTOCOCCUS PYOGENES — VIRULENCE FACTORS AND PATHOGENESIS (5–20 marks, appears repeatedly) (Streptococcus Classification, S. pyogenes, Rheumatic Fever, AGN)
- Outline the virulence factors of Streptococcus pyogenes (5 marks) (Medical Bacteriology MCQs: ETEC, Pseudomonas, Salmonella & More)
Study material on Streptococcus Pyogenes
Practice questions on Streptococcus Pyogenes
Which of the following conditions are associated with Streptococcus pyogenes?
- Scarlet fever
- Rheumatic fever
- All of the above
- None of the above
Answer: C. Streptococcus pyogenes causes both scarlet fever and rheumatic fever. ---
Which one of the following is a potential complication of untreated Streptococcus pyogenes pharyngitis?
- Rheumatic fever
- Diphtheria
- Otitis externa
- Pneumocystis pneumonia
Answer: A. Rheumatic fever is a serious non-suppurative complication that can develop after an untreated or inadequately treated Group A Streptococcus (GAS) pharyngitis.
Which one of the following is a potential non-suppurative complication of Streptococcus pyogenes pharyngitis?
- Rheumatic fever
- Osteomyelitis
- Gas gangrene
- Botulism
Answer: A. Acute Rheumatic Fever is a post-streptococcal sequela following untreated pharyngitis.
Which one of the following is a non-suppurative complication of Streptococcus pyogenes pharyngitis?
- Rheumatic fever
- Otitis media
- Peritonsillar abscess
- Sinusitis
Answer: A. Rheumatic fever and Glomerulonephritis are immune-mediated (non-suppurative) complications of Strep throat.