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Table 1 The CFU counts quantified by category of growth on agar plates, corresponding to colony forming units per 0.1 ml transport medium

From: Efficacy evaluation of a cordless ultrasonic unit in achieving reduction of bacterial load within a root canal system as compared to a conventional ultrasonic unit and negative pressure irrigation

Grading scoreGrowth descriptorCFU
0, blueNone0
1, dark blueVery sparse1–10
2, orangeSparse11–100
3, burnt orangeModerate101–1000
4, dark orangeHeavy1001–10000
5, deep blueVery heavy> 10000