What are the racial predilections for ankylosing spondylitis (AS) and undifferentiated spondyloarthropathy (USpA)?

Updated: Jul 17, 2018
  • Author: Lawrence H Brent, MD; Chief Editor: Herbert S Diamond, MD  more...
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The prevalence of AS parallels the prevalence of HLA-B27 in the general population. The prevalence of HLA-B27 and AS is higher in whites and certain Native Americans than in African Americans, Asians, and other nonwhite ethnic groups. [32, 29] AS is least prevalent in sub-Saharan Africa. The less common juvenile-onset version of AS is more common among Native Americans, Mexicans, and persons in developing countries.

USpA is not associated as strongly with HLA-B27, although it is more prevalent in whites than in nonwhite ethnic groups. [54]

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