[1] Univ Sassari, Microbiol Sect, Dept Biomed Sci, Ctr Excellence Biotechnol Dev & Biodivers Res, I-07100 Sassari, Italy
[2] Temple Univ, Sch Med, Dept Neurosci, Philadelphia, PA 19122 USA
[3] Temple Univ, Sch Med, Ctr Neurovirol, Philadelphia, PA 19122 USA