It was also found that the presence of HLA‐E*01:03 in the donor's genotype (HLA‐E*01:01, 01:03, or HLA‐E*01:03, 01:03) reduced the risk of severe bacterial infection post‐transplant compared to HLA‐E*01:01, 01:01 donors [84]. Here, HLA-E is linked to bacterial infectious disease.