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Yamaguchi Criteria
| Major Criteria | Minor Criteria |
| Fever >39°C of one week or longer | Sore throat |
| Arthralgia or arthritis of greater than 2 weeks | Lymphadenopathy |
| Typical Rash | Hepatomegaly/Splenomegaly |
| Leukocytosis >10,000/mm3 | Abnormal liver function tests |
| Exclusion Criteria | Negative antinuclear antibody and RF |
| Infections | |
| Malignancies | |
| Other rheumatic disease |
