[1] Ist Super Sanita, Dept Infect Parasit & Immunomediated Dis, I-00161 Rome, Italy
[2] Ist Super Sanita, Natl Ctr Epidemiol Surveillance & Hlth Promot, I-00161 Rome, Italy
[3] Infett Presidio Osped Giovani Di Cristina, Unita Operat Clin Malattie, Palermo, Italy