marginally significantP =0.031
2a ) with a marginally significant change in the level of cell aggregation as shown by the lower change in OD 600 between undisturbed and disturbed cultures (0.88 vs. 0.99, Wilcoxon rank sum P =0.031; for comparison, the non-motile C. difficile IS58 had 1.84-fold change in OD 600 , Fig. 2b ).