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What is a CFU?

CFU (colony-forming units) is a unit of measurement used to estimate the number of viable bacterial colonies that form on a petri dish.

Viability is an organism's ability to reproduce. CFU is calculated by counting the number of viable colonies that form on a petri dish.

Colonies are only visible if they have reproduced significantly which implies that the sample is both viable and healthy. Once a plate has visible colonization, the CFU can be calculated for that sample.

Further Reading:

How to Measure CFU

Published in: Probiotics