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Updated: Jun 21, 2026

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

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Published on: February 24, 2014

Streptococcus sinensis may react with Lancefield group F antiserum.

Patrick Cy Woo1, Jade Ll Teng1, Kit-Wah Leung1

  • 1Department of Microbiology, The University of Hong Kong, University Pathology Building, Queen Mary Hospital, Hong Kong.

Journal of Medical Microbiology
|October 22, 2004
PubMed
Summary

Lancefield group F streptococci, often identified as

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Clinical Diagnostics

Background:

  • Lancefield group F streptococci are typically associated with the 'Streptococcus milleri' group.
  • These bacteria can cause serious infections, including infective endocarditis.

Purpose of the Study:

  • To investigate the identity of Streptococcus sinensis strains causing bacteraemia.
  • To determine if Streptococcus sinensis can be misidentified within the 'Streptococcus milleri' group.

Main Methods:

  • Bacteraemia case review and microbiological analysis of three Streptococcus sinensis strains.
  • 16S rRNA gene sequencing and biochemical identification using Vitek, API, and ATB systems.
  • Lancefield grouping to determine serological classification.

Main Results:

  • Three cases of bacteraemia caused by Streptococcus sinensis were identified, all with infective endocarditis.
  • Two strains (HKU5, HKU6) were Lancefield group F, while one (HKU4T) was non-groupable.
  • Biochemical identification showed varied results, with some strains misidentified as Streptococcus intermedius or Streptococcus anginosus.

Conclusions:

  • A proportion of Lancefield group F streptococci can be Streptococcus sinensis.
  • Routine reporting of Lancefield group F streptococci as 'Streptococcus milleri' may be inaccurate.
  • Accurate identification of viridans streptococci is crucial for appropriate patient management.