🦠 Organism of the Week: Streptococcus pyogenes
🧪 Quick Lab Snapshot (HIGH-YIELD)
• Gram stain: Gram-positive cocci in chains
• Catalase: Negative ❌
• Hemolysis: β-hemolytic (clear zone)
• Group: Lancefield Group A
• Bacitracin: Sensitive
• PYR: Positive
🩺 Classic Clinical Associations
• Pharyngitis (“strep throat”)
• Scarlet fever (strawberry tongue 🍓)
• Impetigo
• Cellulitis
• Necrotizing fasciitis
• Rheumatic fever (post infection complication)
• Post-strep glomerulonephritis
💡 Exam Mnemonic
“A PYRate is Sensitive”
👉 Group A Strep
👉 PYR positive
👉 Bacitracin sensitive
You see Gram-positive cocci in chains with beta hemolysis.
What is your NEXT test?
👇 Drop your answer below!
Answer + explanation later…
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🦠 Organism of the Week: Streptococcus pyogenes
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