TABLE 3.

Average effective log repair of E. coli under dark incubation conditions

Weighted UV dose (mJ/cm2)UV sourceTime for maximum repair (min)Log CFU/ml (avg ± SD) after:Avg effective log repaira
UVExposure to dark
5Low1206.1 ± 0.126.2 ± 0.190.1
5Medium1203.8 ± 0.903.9 ± 0.810.1
8Low1803.6 ± 0.383.9 ± 0.280.4
8Medium1803.4 ± 0.323.4 ± 0.520.0
10Low1803.0 ± 0.243.2 ± 0.180.3
10Medium1803.1 ± 0.173.2 ± 0.130.0
  • a Calculated as CFU per milliliter after dark exposure − CFU per milliliter after UV.