## Distinguishing True from False Features in Enteric Fever ### Rose Spots: The Misconception **Key Point:** Rose spots are NOT pathognomonic and appear in only 5–15% of enteric fever cases, not >80%. They are small (1–2 mm), blanching, rose-red macules typically found on the trunk, and when present are highly suggestive of enteric fever—but their absence does NOT exclude the diagnosis. ### Correct Features of Enteric Fever | Feature | Accuracy | |---------|----------| | Invasion via Peyer's patches → bacteremia | ✓ True — hallmark pathophysiology | | Hepatosplenomegaly common | ✓ True — occurs in 50–80% of cases | | Relative bradycardia | ✓ True — fever with proportionally lower pulse rate is classic | | Rose spots in >80% | ✗ False — present in only 5–15% | ### Pathophysiologic Sequence 1. Ingestion of contaminated food/water 2. Invasion of small intestinal mucosa via Peyer's patches 3. Intracellular multiplication in macrophages 4. Bacteremia → systemic seeding (liver, spleen, bone marrow) 5. Characteristic fever curve (step-ladder pattern in untreated cases) **Clinical Pearl:** Relative bradycardia (pulse-temperature dissociation) is so characteristic that its presence supports the diagnosis; its absence should prompt consideration of other febrile illnesses. **High-Yield:** Rose spots, when present, are highly specific but insensitive. Do NOT teach students that rose spots are present in most cases—this is a common exam trap. [cite:Harrison 21e Ch 159]
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