HLA-DRB1 and myeloid sarcoma: A 70-percent decreased rate of MS in remote infection with cytomegalovirus (CMV), 70-percent decreased rate in remote infection with herpes virus types 1 in HLA-DRB1 positive patients, and an almost 4-fold decreased rate of the disease in HLA DRB1 negative people are suggestive of gene-environmental interactions (17).