Total viable organism
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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.
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