FIG 1.

UV₂₂₂ killing of spores of different species. Spores of different species were treated with UV₂₂₂, and spore survival was measured, all as described in Materials and Methods. Symbols: ○, B. subtilis PS533 (wild type); ●, B. thuringiensis Al Hakam; △, B. cereus T; ▲, C. difficile 43593; □, C. difficile JIR8094. Data shown are averages from duplicate determinations ± standard deviations in one experiment. This experiment was repeated 3 times, and the same relative rates of killing of spores of different species were seen.