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Updated: May 16, 2026

Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
Published on: February 24, 2014
Sequential triplex real-time PCR assay for detecting 21 pneumococcal capsular serotypes that account for a high
Fabiana C Pimenta1, Alexis Roundtree, Ahmet Soysal
1Respiratory Diseases Branch, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
Abstract:
We developed and validated a real-time PCR assay consisting of 7 triplexed reactions to identify 11 individual serotypes plus 10 small serogroups representing the majority of disease-causing isolates of Streptococcus pneumoniae. This assay targets the 13 serotypes included within the 13-valent conjugate vaccine and 8 additional key serotypes or serogroups. Advantages over other serotyping assays are described. The assay will be expanded to 40 serotypes/serogroups. We will provide periodic updates at our protocol website.
