Effectiveness of pneumococcal polysaccharide vaccine for preschool-age children with chronic disease

Research findings show that pneumococcal capsular polysaccharide vaccines are effective in protecting 94% of the vaccinated preschool-age children with pneumococcal disease.
To estimate the effectiveness of pneumococcal polysaccharide vaccine, we serotyped isolates submitted to the Pneumococcal Sentinel Surveillance System from 1984 to 1996 from 48 vaccinated and 125 unvaccinated children 2 [...]