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Related Experiment Video

Updated: Nov 22, 2025

Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction

Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction

Published on: February 24, 2014

Sugar-Coated Killer: Serotype 3 Pneumococcal Disease.

Jennifer N Luck¹, Hervé Tettelin², Carlos J Orihuela¹

¹Department of Microbiology, The University of Alabama at Birmingham, Birmingham, AL, United States.

Frontiers in Cellular and Infection Microbiology

|January 11, 2021

Summary

Streptococcus pneumoniae's capsule is key to virulence, with serotype 3 causing severe infections and resisting vaccines. Understanding serotype 3's unique properties is crucial for developing effective treatments and vaccines.

Keywords:

Streptococcus pneumoniae capsule production invasive pneumococcal disease serotype 3 synthase-dependent pathway vaccine escape wzy-dependent pathway

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Last Updated: Nov 22, 2025

Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction

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Experimental Human Pneumococcal Carriage

Experimental Human Pneumococcal Carriage

Published on: February 15, 2013

Area of Science:

Microbiology
Immunology
Pathogenesis

Background:

Capsular polysaccharide (CPS) is a major virulence factor for Streptococcus pneumoniae.
CPS protects bacteria from host defenses and aids colonization.
20-30 S. pneumoniae capsule types cause opportunistic infections, with serotype 3 being particularly virulent.

Purpose of the Study:

To review the role of capsular polysaccharide in S. pneumoniae pathogenesis.
To highlight the unique characteristics of serotype 3 that contribute to severe disease.
To explain the limitations of current vaccines against serotype 3.

Main Methods:

Literature review focusing on S. pneumoniae capsule function and serotype 3.
Analysis of biochemical and physiological properties of serotype 3 capsule.
Discussion of vaccine efficacy and serotype 3 clonal evolution.

Main Results:

Serotype 3 capsule exhibits distinct synthesis and surface presentation.
Its biochemical and physiological properties enhance virulence and resistance to immune clearance.
Current 13-valent vaccines are ineffective against serotype 3 due to its unique characteristics.

Conclusions:

Serotype 3 S. pneumoniae remains a significant public health threat due to its inherent virulence and vaccine resistance.
Further research into serotype 3's unique properties is needed for improved therapeutic and vaccine strategies.
Understanding clonal properties of serotype 3 is essential for tracking its evolution and impact post-vaccine introduction.