The density of CD8+ and CD4+ cells tended to decrease with the grade of diarrhoea (respectively, 1531 ± 577 CD8+ cells/mm2 and 709 ± 493 CD4+ cells/mm2 in grade 2 diarrhoea versus 661 ± 389 and 356 ± 216 in grade 3 diarrhoea) but the difference was not statistically significant. This evidence concerns the gene CD4 and Diarrhea.