🧪 Answer Reveal: Quick Recall Question

Question: Which test helps differentiate Enterococcus from non-enterococcus Group D strep?

✅ Correct Answer: B) PYR

🧠 Explanation:

Enterococcus species are:

✔ PYR positive

✔ Usually grow in 6.5% NaCl broth

Non-enterococcus Group D streptococci (like Streptococcus bovis/gallolyticus) are typically:

❌ PYR negative

❌ Do not grow well in 6.5% NaCl

This makes the PYR test a very important quick differentiation tool in the lab 🔬

🔬 Why not the other options?

A) Catalase ❌

• Used to differentiate Staphylococcus from Streptococcus

C) Coagulase ❌

• Used to identify Staphylococcus aureus

D) Oxidase ❌

• Mainly used for Gram-negative organisms

💡 Quick Recall Tip:

🔥 Enterococcus = PYR positive

👉 Think:Enterococcus faecalis → PYR positive + grows in 6.5% NaCl

👇 Did you get it right? Drop a 🧫 or 🔥 below!

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