title: Welcome from the Editors-in-Chief.
authors.affiliation: Key Lab of Medical Molecular Virology, Shanghai Medical College, Fudan University , Shanghai 200032, China.
authors.forename: Yu-Mei
authors.initials: YM
authors.lastname: Wen
authors.affiliation: Philipps-Universität Marburg, Institut für Virologie , Hans-Meerwein-Str. 2, D-35043 Marburg, Germany.
authors.forename: Hans-Dieter
authors.initials: HD
authors.lastname: Klenk