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Vaccine. 2009 Aug 21;27 Suppl 3:C15-8. doi: 10.1016/j.vaccine.2009.06.008.

Essential criteria for evaluation of pneumococcal conjugate vaccine candidates.

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Wyeth Vaccines, Wyeth Pharmaceuticals, 500 Arcola Road, Collegeville, PA 19426, USA.


In 2003, the World Health Organization recommended a concentration of enzyme-linked immunosorbent assay (ELISA) immunoglobulin G (IgG) anti-capsular antibody of 0.35 microg/mL as a reference value that correlates to protection against invasive pneumococcal disease. This threshold can be used to demonstrate immunologic non-inferiority of a new vaccine in comparison trials that use pneumococcal conjugate vaccines (PCVs) as a comparator. An investigational 13-valent PCV (PCV13) compared with seven-valent PCV (PCV7) demonstrated that all of the pneumococcal serotypes contained in PCV13 were immunogenic, with 88-98% of vaccinees achieving antibody concentration > or = 0.35 microg/mL for serotypes shared with PCV7 and >96% for six additional serotypes.

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