## Pathophysiology and Clinical Features of Enteric Fever ### Correct Answer Analysis **Key Point:** Intestinal perforation in enteric fever typically occurs in the **third week of illness**, not the first week. This complication arises after extensive necrosis of Peyer's patches in the ileum, which takes time to develop. ### Why the Other Options Are Correct | Feature | Explanation | |---------|-------------| | **Rose spots** | Characteristic 2–3 mm blanching maculopapular rash appearing in 5–15% of cases, typically in the second week; not truly pathognomonic but highly suggestive | | **Organism invasion** | *Salmonella typhi* enters via M cells overlying Peyer's patches in the terminal ileum, causing focal necrosis and bacteremia | | **Splenomegaly** | Common finding (50–60% of cases) due to hyperplasia of splenic follicles and reticuloendothelial activation | ### Timeline of Complications **High-Yield:** The classic **4-week progression** of untreated enteric fever: - **Week 1:** Sustained fever, headache, myalgia, rose spots may appear late - **Week 2–3:** Rose spots peak, hepatosplenomegaly, abdominal distension, "rose spots" rash - **Week 3–4:** **Intestinal perforation risk peaks** (ileal necrosis), myocarditis, encephalopathy - **Week 4+:** Recovery phase or complications **Clinical Pearl:** Perforation is a surgical emergency with mortality >20% even with treatment. It occurs when transmural necrosis of the ileum becomes full-thickness, typically after the second week. **Warning:** Do not confuse timing — perforation is a **late complication** (week 3–4), not early.
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