9-valent CRM 197 Pneumococcal

Saline placebo administered in a volume of 0.5 ml intramuscularly.

The 23-valent pneumococcal vaccine (PS) vaccine will contain a mixture of 25 micrograms purified, pneumococcal polysaccharide of each of 23 serotypes of Streptococcus pneumoniae per 0.5 ml dose in isotonic saline and 0.01% thimerosal. The vaccine will be administered in a volume of 0.5 ml intramuscularly.

Cross-reactive material 197 (CRM 197) is a product of the Corynebacterium diphtheria C7. Vaccine is prepared from pneumococcal polysaccharides of types 1, 4, 5, 9V, 14, 18C, 19F, 23F (2 mcg each) and 6B (4 mcg) covalently linked to CRM197 by reductive amination. The protein-polysaccharide combination is prepared as a lyophilized powder with aluminum phosphage which is reconsitituted before use. The vaccine will be administered in a volume of 0.5 ml intramuscularly.