1 Laboratory of Virology, National Institute for Infectious Diseases 'Lazzaro Spallanzani' (IRCCS), Rome 00149, Italy.
2 Laboratory of Virology, National Institute for Infectious Diseases 'Lazzaro Spallanzani' (IRCCS), Rome 00149, Italy. Electronic address: francesca.colavita@inmi.it.
3 Clinical and Research Department, National Institute for Infectious Diseases 'Lazzaro Spallanzani' (IRCCS), Rome 00149, Italy.
4 Scientific Direction, National Institute for Infectious Diseases 'Lazzaro Spallanzani' (IRCCS), Rome 00149, Italy.
5 General Direction, National Institute for Infectious Diseases 'Lazzaro Spallanzani' (IRCCS), Rome 00149, Italy.