“…The exact role of the allele in promoting disease remains unknown. It is of great interest however that the prevalence of Behçet's disease is low both in central and west African populations, being limited to no more than eight reports of individual cases or short series, [3][4][5][6][7][8][9][10][11] and only one previous report has described patients from the Caribbean, all of whom were HLA-B51 negative. 12 Furthermore, at least two of the reports in the world literature describe patients resident in the United Kingdom, 7 8 supporting the view that the true prevalence of disease in native African or Afro-Caribbean populations is very low indeed.…”