Duffy Antigen is what I am thinking about with sickle cell
Duffy antigen as it relates to HIV
https://retrovirology.biomedcentral.com/articles/10.1186/1742-4690-10-S1-O31
The African-specific DARC null allele increases risk of HIV infection.
HIV-2 strains but not HIV-1 strains utilised DARC as an entry co-receptor. However, HIV-1 could bind to DARC on red cells and be delivered to activated CD4+ T-cells resulting in subsequent infection. GWAS analysis confirmed the link between DARC null genotype and African benign neutropenia. The DARC null phenotype with African benign neutropenia resulted in low CCL5 plasma levels and increased the relative risk of HIV-1 infection approximately 3-fold.