Anti-Hp antibodies were present in 23/62 (37.1%) MS patients of ≤40 years compared to 37/77 (48.1%, p = ns) of >40 years; anti-Hp antibodies were present in 3/15 (20%) HCs of ≤40 years compared to 30/53 (56.6%, p = 0.018) of >40 years. The gene discussed is HP; the disease is myeloid sarcoma.