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  • Title: Effectiveness of the new serotypes in the 13-valent pneumococcal conjugate vaccine.
    Author: Miller E, Andrews NJ, Waight PA, Slack MP, George RC.
    Journal: Vaccine; 2011 Nov 15; 29(49):9127-31. PubMed ID: 21983361.
    Abstract:
    Efficacy of the new serotypes in the 13-valent pneumococcal conjugate vaccine (PCV13) against invasive pneumococcal disease (IPD) was based on a putative correlate of protection. In England and Wales, PCV13 replaced PCV7 in the 2, 4, and 13 month schedule in April 2010. Using non-vaccine type IPD cases as controls, we estimated vaccine effectiveness (VE) for the new serotypes. Among 166 IPD cases in PCV13 eligible children reported by July 2011 with known serotype and vaccination status, VE for 2 doses under a year was 78% (95% confidence interval -18% to 96%) and 77% (38-91%) for one dose over a year. VE for 7F and 19A was 76% (21-93%) and 70% (10-90%) respectively for ≥one dose. VE for serotypes 1 and 3 was 62% and 66% respectively although confidence intervals spanned zero. IPD due to PCV13-only serotypes halved in children under 2 years in the study period.
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