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Related Experiment Video

Updated: Jun 19, 2026

Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction
04:25

Capsular Serotyping of Streptococcus pneumoniae Using the Quellung Reaction

Published on: February 24, 2014

METHODS FOR THE DETERMINATION OF PNEUMOCOCCUS TYPES.

F G Blake1

  • 1Hospital of The Rockefeller Institute for Medical Research.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Rapidly identifying pneumococcus types is crucial for pneumonia prognosis and serum therapy. A new precipitin method offers a faster, more reliable alternative to traditional agglutination, especially when other bacteria interfere.

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Last Updated: Jun 19, 2026

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09:11

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Experimental Human Pneumococcal Carriage
07:47

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Published on: February 15, 2013

Area of Science:

  • Microbiology
  • Immunology
  • Clinical Diagnostics

Background:

  • Pneumococcus typing is vital for lobar pneumonia prognosis and specific serum therapy.
  • Current methods for pneumococcus typing face challenges with speed and accuracy due to interfering organisms and cross-reactions.

Purpose of the Study:

  • To develop a rapid and reliable method for determining pneumococcus types in lobar pneumonia.
  • To overcome limitations of existing agglutination-based typing methods.

Main Methods:

  • Intraperitoneal inoculation of mice with patient sputum for pneumococcus culture.
  • Diagnosis of pneumococcus type using agglutination reactions with specific antisera.
  • Development and application of a novel precipitin method utilizing pneumococcal soluble substance in peritoneal exudate.

Main Results:

  • Optimized serum dilutions (1:20 for I and II, 1:5 for III) were determined for agglutination, with undiluted Type II serum for Subgroup II.
  • The precipitin method demonstrated effectiveness comparable to agglutination.
  • The precipitin method offers significant time-saving advantages, particularly when mixed bacterial growth complicates diagnosis.

Conclusions:

  • The precipitin method is recommended as the method of choice for pneumococcus typing due to its speed and reliability.
  • This method enhances diagnostic efficiency in clinical settings, especially in cases with mixed infections.
  • Both agglutination and precipitin methods can be applied concurrently for comprehensive typing.