[1] Univ Cattolica Sacro Cuore, Inst Microbiol, Agostino Gemelli Hosp, I-00168 Rome, Italy
[2] Univ Cattolica Sacro Cuore, Inst Infect Dis, Agostino Gemelli Hosp, I-00168 Rome, Italy
[3] Univ Siena, Microbiol Sect, Dept Biotechnol, I-53100 Siena, Italy
[4] Siena Univ Hosp, Clin Microbiol & Virol Unit, Siena, Italy