In addition, Bistrom et al. found that HHV-6A was associated with increased MS risk in all age groups (total cohort odds ratio 2.1, 95% confidence interval 1.6–2.7) [17] while Amini et al. demonstrated a significant HHV-6 seropositivity (90.6% in 560 MS patients) and significantly higher levels of Matrix Metalloproteinase 9 (MMP-9) in HHV-6 seropositive patients (p = 0.001) as well as Expanded Disability Status Scale (EDSS) score [18]. The gene discussed is MMP9; the disease is myeloid sarcoma.