Detection of Epstein–Barr virus and B-cell follicles in the multiple sclerosis brain: what you find depends on how and where you look

Sir, The research article by Willis et al. (2009) and the letter to the editor by Peferoen et al. (2010) challenge our earlier finding that infection with Epstein–Barr virus is a common feature in the multiple sclerosis brain, provided that autopsy samples containing immune infiltrates are analys…