MICROBIOLOGY - Endotoxins vs Exotoxins Vol 4 | NEET PG 2022 PYQ

🎧 High-Yield Daily Clinical Revision Podcast for NEET PG, FMGE, and INI-CET! 📖 Clinical Case Study: [Challenge Vol 4] A patient develops septic shock from a Gram-negative bacterial infection. Which component of the outer membrane of Gram-negative bacteria acts as the endotoxin responsible for triggering this inflammatory cascade? 📝 Options: • Option A: A. Lipid A component of Lipopolysaccharide (LPS) • Option B: B. Peptidoglycan cell wall • Option C: C. O-antigen polysaccharide • Option D: D. Teichoic acid ✅ Correct Answer: Option A 💡 Explanation: Lipid A is the toxic component of lipopolysaccharide (LPS), which is found in the outer membrane of Gram-negative bacteria. When bacteria lyse, Lipid A triggers macrophages to release TNF-alpha, IL-1, and IL-6, causing septic shock. (Volume 4 High-Yield Concept Review) 🧠 Mnemonic: Endotoxin vs Exotoxin V4 • Endotoxin source ➔ Gram-negative outer membrane (LPS) • Toxic moiety ➔ Lipid A (causes macrophage activation) • Key cytokines released ➔ TNF-alpha, IL-1, IL-6 ⚠️ Exam Trap to Avoid: O-antigen is used for serotyping but is non-toxic; Lipid A is the component that causes septic shock. 🔗 Follow Us & Prepare Smart: • 📸 Instagram: instagram.com/drstemcell_1 • 🧵 Threads: threads.net/@drstemcell_1 • 📺 YouTube: youtube.com/@drstemcell-o2h • 👥 Facebook: facebook.com/drstemcell • 🍎 Apple Podcasts: Apple Podcasts Link 🏆 Join the discussion! Did you get this correct? Drop your option or score in the comments below! 👇 #NEETPG #FMGE #INICET #MBBS #DrStemCell #MedEd