Comment on

• Decline in invasive pneumococcal disease after the introduction of protein-polysaccharide conjugate vaccine.

  Whitney CG, Farley MM, Hadler J, Harrison LH, Bennett NM, Lynfield R, Reingold A, Cieslak PR, Pilishvili T, Jackson D, Facklam RR, Jorgensen JH, Schuchat A; Active Bacterial Core Surveillance of the Emerging Infections Program Network. Whitney CG, et al. N Engl J Med. 2003 May 1;348(18):1737-46. doi: 10.1056/NEJMoa022823. N Engl J Med. 2003. PMID: 12724479