A 38-year-old man with a history of rheumatic mitral stenosis presents with fever, new cardiac murmur, and splinter hemorrhages. Blood cultures grow Streptococcus viridans. Regarding the modified Duke criteria for diagnosis of infective endocarditis, all of the following are major criteria EXCEPT:

Explanation

## Modified Duke Criteria — Major vs Minor Criteria **Key Point:** The modified Duke criteria (1998) define major and minor criteria for IE diagnosis. Understanding this distinction is essential for NEET PG. ### Major Criteria (3 categories) | Criterion | Details | | --- | --- | | **Blood culture** | Typical organism from 2 separate cultures (viridans streptococci, S. aureus, enterococci, HACEK, Coxiella burnetii) | | **Echocardiography** | Oscillating mass on valve, abscess, new prosthetic dehiscence, or new regurgitation | | **New regurgitant murmur** | Aortic or mitral regurgitation (not innocent murmur) | ### Minor Criteria (5 categories) - Predisposition (RHD, IVDU, prosthetic valve) - Fever ≥38°C - Vascular phenomena (splinter hemorrhages, Osler nodes, Janeway lesions, septic emboli) - Immunologic phenomena (Roth spots, glomerulonephritis, rheumatoid factor) - Microbiologic evidence not meeting major criterion **High-Yield:** ESR and CRP elevation are **non-specific inflammatory markers** — they are NOT part of the Duke criteria (neither major nor minor). They may be elevated but do not contribute to the diagnostic score. **Clinical Pearl:** Diagnosis requires either: - 2 major criteria, OR - 1 major + 3 minor criteria, OR - 5 minor criteria **Warning:** Do not confuse ESR/CRP elevation (which occurs in IE) with formal Duke criteria. Many students incorrectly assume elevated ESR is a minor criterion — it is not.