[1] Agcy Publ Hlth, Dept Epidemiol, I-00198 Rome, Italy
[2] IRCCS, Ist Nazl Malattie Infett, Clin Pathol Lab, Reg Reference Lab Streptococcus Pneumoniae, I-00149 Rome, Italy
[3] Univ Roma La Sapienza, Dept Publ Hlth, Microbiol Lab, Reg Reference Lab Neisseria Meningitidis, I-00161 Rome, Italy
[4] Paediat Hosp, Bacteriol Lab, Reg Reference Lab Haemophilus Influenzae, I-00185 Rome, Italy