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We studied, by pulsed-field gel electrophoresis, multilocus sequence typing and penicillin-binding protein 2b amplicon-restriction profiles, pneumococcal isolates recovered from children with acute otitis media during 1 January-31 December 1999 and 2001. The proportion of nonvaccine serogroups increased from 14.8% (13/88) to 36.5% (23/63) from 1999 to 2001 (P&lt;.01). Among children who received at least 2 doses of the pneumococcal 7-valent protein conjugate (PNC7) vaccine, 46.7% (7/15) of the isolates had nonvaccine serogroups, compared with 20.8% (26/125) of the isolates from children who did not receive the PNC7 vaccine (P=.05). Overall, the serogroups involved in capsular switching were 6-19-NT, 6-14-35, 15-19, and the 19-Spanish 23F clone. In 1999 and 2001, 30.8% (4/13) and 26.1% (6/23) of the nonvaccine serogroups were implicated in capsular switching, respectively. Continued surveillance will be of great importance as the distribution of the PNC7 vaccine increases.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Epidemiology of Acute Otitis Media Caused by<i>Streptococcus pneumoniae</i>Before and After Licensure of the 7‐Valent Pneumococcal Protein Conjugate Vaccine

Epidemiology of Acute Otitis Media Caused byStreptococcus pneumoniaeBefore and After Licensure of the 7‐Valent Pneumococcal Protein Conjugate Vaccine