system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
HLA B 27 is not seen in which of the following
assistant
The correct answer is  Ref Robbins 9/e p215 HLA and diseases, the association of B27 with ankylosing spondylitis (AS) is the strongest. The B27 antigen is present in over 90% of patients with AS as com- pared with the B27 prevalence of 8% in Caucasians in general. A strong but slightly minor association has also been found between B27 and Reiter's syndrome (RS), reactive ahritis (ReA), and acute anterior uveitis (AAU). It is negative in rheumatoid ahritis