Whether the putative new retrovirus ( es ) and EBV have any causal relationship to MS is still not known , but the findings support this possibility .
whether the putative new retrovirus ( es ) and ebv have any causal relationship to ms is still not known , but the findings support this possibility .
O O B-virus I-virus I-virus O O O O B-virus O O B-other_name I-other_name O B-other_name O O O O O O O O O O O O