Total viable organism

Total viable organism (or TVO) is a term used in microbiology to quantify the amount of microorganisms present in a sample.^[1] Each sample is usually cultured on a variety of agar plates (petri dishes) often containing different types of selective media. The colony-forming units (CFUs) are calculated after allowing time for growth.

TVO numbers are used to quantify the CFUs for a given amount of sample and often include dilution factors. For example, a 1 mL sample of water containing 10 CFUs on one plate would have a TVO value of 10 cfu/mL.

References

^ Massicotte, Richard; Mafu, Akier A; Ahmad, Darakhshan; Deshaies, Francis; Pichette, Gilbert; Belhumeur, Pierre (2017). "Comparison between Flow Cytometry and Traditional Culture Methods for Efficacy Assessment of Six Disinfectant Agents against Nosocomial Bacterial Species". Frontiers in Microbiology. 8: 112. doi:10.3389/fmicb.2017.00112. PMC 5289957. PMID 28217115.

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[1] Massicotte, Richard; Mafu, Akier A; Ahmad, Darakhshan; Deshaies, Francis; Pichette, Gilbert; Belhumeur, Pierre (2017). "Comparison between Flow Cytometry and Traditional Culture Methods for Efficacy Assessment of Six Disinfectant Agents against Nosocomial Bacterial Species". Frontiers in Microbiology. 8: 112. doi:10.3389/fmicb.2017.00112. PMC 5289957. PMID 28217115.

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