Figure 3. Precursor frequency does not contribute significantly to the immunodominance of SIINFEKL-specific CD8 T-cell responses in chronic infection.
(A) OVA Tg mice were infected i.p. with the indicated viruses. Virus-specific CD8 T-cells were measured in the blood on day 7 and at week 18 post infection using intracellular cytokine staining. (B) C57BL/6 mice were injected with 10μg SIINFEKL peptide i.v. on days -3,-2 and -1 prior to infection with MCMV-GFP-SL8. Responses were measured in the blood on day 7 and at week 18 post infection (C) CD45.2+, CD45.1+ naive recipients received 2–5×107 unfractionated splenocytes from mice infected for 7 days with WT MCMV. Recipients were infected with WT MCMV or with MCMV-GFP-SL8 and virus -specific responses were measured in the blood at week 18 post infection. Total CD8 T-cell responses are shown on the left and percentages of CD45.2-negative donor cells contributing to either IE3 or M38 responses are shown on the right. Bars represent 4–5 mice per group. Experiments were done twice.