CD4 and bacterial infectious disease with sepsis: Specifically, cats in group A showed a significant decrease in the CD4+, CD8+ and CD5+ T lymphocyte counts, with the nadir reached at days 21, 21 and 28 pi, respectively, coinciding with the onset of peak bacteremia (CD4+, pF = 0.0012; CD8+, pF = 0.0002; CD5+, pF < 0.0002, Figures 6A–C).