Fig. 2

Reduction of different clinical VRE isolates with UV-C doses of 50 (A) and 22 mJ/cm² (B). The boxplots represent the reduction factors determined per tested VRE isolate (n = 10) and test organism E. hirae ATCC 10541 in 5 independent experiments, comparing microbial load on ceramic tiles before and after UV-C radiation with 50 (A) and 22 mJ/cm² (B). Boxplots are in ascending order by median. Statistically significant results (p < 0.01) of pairwise Tukey post-hoc analysis are connected by brackets. Non-significant comparisons are not shown. The p-values are displayed as follows: p < 0.01 = *, p < 0.001 = **, p < 0.0001 = ***, and p < 0.00001 = ****