Flow Cytometric Assays to Quantify fHbp Expression and Detect Serotype Specific Capsular Polysaccharides on Neisseria meningitidis

  • Jakob LoschkoEmail author
  • Karen Garcia
  • David Cooper
  • Michael Pride
  • Annaliesa Anderson
Part of the Methods in Molecular Biology book series (MIMB, volume 1969)


Flow cytometry provides an automated analysis of bacteria passing in fluid suspension through a laser light beam. Bacteria are first treated with antibodies that bind to a specific target. These antibodies are tagged to fluorophores that fluoresce when passed through a laser beam. As the bacteria pass sequentially through the laser beam, they absorb and scatter the light in forward and side (90°) angles. The forward angle scatter is proportional to the size of the bacteria and the 90° angle side scatter is proportional to the internal structure (granularity). In addition, the tagged antibodies bound specifically to each bacteria, emit fluorescent light at defined wavelengths that can be collected and measured.

Here we describe two flow cytometry based assays to measure expression levels of protein and polysaccharide on the surface of Neisseria meningitidis.

Key words

Neisseria meningitidis Flow cytometry Surface protein Capsular polysaccharides 



This work was supported by Pfizer.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Jakob Loschko
    • 1
    Email author
  • Karen Garcia
    • 1
  • David Cooper
    • 1
  • Michael Pride
    • 1
  • Annaliesa Anderson
    • 1
  1. 1.Pfizer Vaccine Research and DevelopmentPearl RiverUSA

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