Figure 2: Percent CD4+ T cells before and after vaccination with LAIV and TIV. PBMC were collected on day 0 and 28 following vaccination with either TIV or LAIV. The cells were labeled with CFSE, and then stimulated in culture for 7 days with each virus contained in the 2006 vaccine. The percent CD4+ T cells that were CFSEdim are shown for each individual at each time point, with a group mean indicated on the graph. There was no significant difference between the group mean before and after vaccination.