๐Ÿ”ฌ Plaque Count

Determination of phage titers as indicated by localized lysis of class="bap-term">bacterial lawns.

by Stephen T. Abedon Ph.D. (abedon.1@osu.edu)

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About this entry: Plaque Count is one of a growing set of phage biology and phage therapy terms defined here. For more phage terms, see Abedon, S.T. (2025). Phage Therapy Annotated Glossary. Preprints.org. 10.20944/preprints202508.0347.v1

phage.org/terms/plaque_count.html  ·  Abedon’s Books  ·  DOI: 10.5281/zenodo.20173633

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Plaque Count: Determination of phage titers as indicated by localized lysis of class="bap-term">bacterial lawns.

Discussion

<p>Note that not only do plaque counts determine numbers of plaque-forming units rather than numbers of actual phage particles (see, for example, absolute efficiency of plating), but plaque counts cannot necessarily be equated with numbers of otherwise viable virion particles. See efficiency of plating as well as efficiency of center of infection for additional discussion.

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How to cite this page

Abedon, S.T. (2026). Phage Terms. https://terms.phage.org  ·  10.5281/zenodo.20173633

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Plaque Count — terms.phage.org — phage.org — Stephen T. Abedon — Version 2026.05.14