13d • Organisms of the Week!
🦠 Organism of the Week: Staphylococcus aureus
🧪 Quick Lab Snapshot (High-Yield)
• Gram stain: Gram-positive cocci in clusters 🍇
• Catalase: Positive ✅
• Coagulase: Positive ✅ (key differentiator)
• Blood agar: β-hemolysis
• MSA: Grows + ferments mannitol → yellow
• Reservoir: Normal skin & nares
🩺 Clinical Associations
• Skin & soft tissue infections (boils, abscesses)
• Pneumonia (post-influenza 👀)
• Osteomyelitis
• Endocarditis
• Toxic shock syndrome
• Food poisoning (preformed toxin)
💡 Exam Tip / Mnemonic
“CATs & COAG”
👉 Staph aureus is CATalase positive and COAGulase positive
💬 What’s the first test you think of when you see Gram-positive cocci in clusters on a Gram stain?
0
0 comments
🦠 Organism of the Week: Staphylococcus aureus
powered by
skool.com/microbiology-with-dede-5731
Learn microbiology the easy way with Dede—simple notes, quizzes, and study support for anyone wanting to master micro.
Suggested communities
Powered by