“…The genetic association of HLA-B5 (B51) with BD was initially reported in 1973 by Ohno and coworkers [24]. Subsequently this association has been confirmed in many different ethnic populations in Asia (Japanese [16,[24][25][26][27][28], Korean [29,30], Han Chinese [31], Taiwan Chinese [32], Turk [33][34][35][36][37], Israeli [38][39][40], Palestinian and Jordanian [41], Iranian [42], and Iraqi [43]), Southern Europe (Italian [44][45][46], Greek [47][48][49], Spanish [50], and German [17,51]), Northern Africa (Moroccan [55] and Tunisian [56]), North America (Mexican [59]), and South America (Brazilian [60]), but not in some populations in Northern Europe (British [35,52,53]) and North America (American [57,58]) ( Table 1). Although the odds ratio (OR) for the susceptibility risk of BD among carriers of HLA-B51 has been known to be much higher in the ethnic groups who live in endemic areas along the ancient Silk Road than in the American or British populations, recently published data have shown that the HLA-B51-associated risk could be significantly raised even among some other populations outside the ancient tradin...…”