Condition | Time Intervals | Dilution 10−1 | Dilution 10−2 | Dilution 10−3 | Dilution 10−4 | Dilution 10−5 |
Without UV (Control) | Overnight | 670 CFU | 40 CFU | 20 CFU | 8 CFU | 4 CFU |
Exposure to UV | 10 sec | 211 CFU | 20 CFU | 12 CFU | 6 CFU | <1 CFU |
20 sec | 193 CFU | 14 CFU | 4 CFU | 2 CFU | <1 CFU | |
30 sec | 100 CFU | 1 CFU | 2 CFU | 1 CFU | <1 CFU | |
60 sec | 18 CFU | <1 CFU | <1 CFU | <1 CFU | <1 CFU | |
40 minutes | <1 CFU | <1 CFU | <1 CFU | <1 CFU | <1 |