Abstract
The human leukocyte antigen (HLA) B57 allele and the closely related HLA-B5801 allele are overrepresented among human immunodeficiency virus type 1 (HIV-1)–infected individuals with a long-term nonprogressive clinical course of disease (known as “long-term nonprogressors” [LTNPs]). These alleles are, however, also present among individuals with normal disease progression (known as
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