HLA-DRB1 and Löfgren’s syndrome: In SA, DRB1:*03,*11, DQB1*02 and DQA*0501 alleles were less frequent in Stage I with Löfgren syndrome (acute disease) and DRB1*15 and DQA1:*0102,*0103 in Stage II alleles, while DRB1:*16,*04,*08, DQB1:*03,*04,*05,*06 and DQA1:*0102,*0301 alleles were less frequent in both stages of SA than in the control group.