CD4 and Diarrhea: Diarrhoea incidence was over-dispersed in both HIV seropositive (α = 0.263; p < 0.0001) and HIV seronegative adults (α = 0.983; p < 0.0001), and in adults with CD4 counts of less than 200 cells/μL (α = 0.48; p = 0.001).