What does it mean to have a positive HLA b27?

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  1. #spondylitis
  2. #ankylosing
  3. #negative
  4. #result
  5. #positive
  6. #means
  7. #average
  8. #higher
  9. #certain
  10. #autoimmune
  11. #diseases
  12. #reactive
  13. #arthritis
  14. #found
  15. #blood