Medical Microbiology / Streptococcus pneumoniae / Emerging Infectious Diseases / Prospective studies / Humans / Clinical Sciences / Public health systems and services research / Pulsed field gel electrophoresis (PFGE) / Microbial Sensitivity Tests / Serotyping / Clinical Sciences / Public health systems and services research / Pulsed field gel electrophoresis (PFGE) / Microbial Sensitivity Tests / Serotyping