Figure 4.

Geriatric donors' CD8⁺ T cell response to influenza A epitopes. A) Frequency of peptide specific cells from geriatric donors after three weeks of aAPC stimulation as determined by ICS for IFNg secretion and analyzed by flow cytometry. Background levels were determined by stimulating CD8⁺ T cells with unpulsed T2 cells, as described in figure 2. Figure 2 is a representative example of background levels for all donors. All data points displayed are 5 fold above background.