CD19 and Diarrhea: In patients with C. difficile-associated diarrhoea, a significantly greater proportion of events were seen in the CD19-positive, IgD-negative gate in PBMCS exposed to toxin A488 [0.09% (0-0.54) versus 0.92% (0.09-1.78%); p<0.001 Wilcoxon matched-pairs], compared to control buffer.