FIG. 1.

Peripheral blood and LN CD8⁺ lymphocyte counts during the acute phase of FIV infection. Peripheral blood (a) and lymph node (b) lymphocytes were collected at the time points post-FIV infection (shaded triangles) or sham infection (open circles) and stained with anti-CD8 and analyzed by flow cytometry. The CD8⁺ nadir for FIV⁺ cats occurs at day 14 in both the peripheral blood and LNs. A manual lymphocyte count multiplied by the percentage of CD8⁺ cells obtained via FACS analysis yielded the absolute count for the CD8⁺ population. Each time point represents the mean cell count (FIV⁺ cats n = 4, FIV^– cats n = 2).