Which of the following is not true about Juvenile rheumatoid ahritis?

Juvenile idiopathic ahritis is characterized by chronic ahritis involving one or more joints for at least 6-12 weeks. It can be of four types such as: oligoaicular, polyaicular, systemic, and enthesitis-associated. Fever and uveitis are associated with these types of juvenile rheumatoid ahritis. Ref: CURRENT Diagnosis and Treatment: Pediatrics, 20th Edition, Chapter 27