Pre-Existing Immunity Against Adenovirus Does Not Compromise the Systemic or Mucosal Cellular Response Generated Against Ebola Glycoprotein After Intranasal Immunization.

<p>The frequency of IFN-γ positive mononuclear cells was analyzed from the spleen (panels A and C), the lung via bronchioalveolar lavage (BAL) and the intestine via the mesenteric lymph nodes (MLN) and Peyer's patches (PP) (panels B and D) 45 days post-immunization by ELISPOT. Samples were obtained from naïve animals (Panels A and B) and those with pre-existing immunity to adenovirus serotype 5 (Panels C and D). Cells were plated at 1×10⁵ or 1×10⁴ cells per well, stimulated with the TELRTFSI peptide and expression of IFN-γ detected with an anti-mouse IFN-γ antibody. Cells isolated from BAL, MLN or PP of four mice were pooled and samples tested in duplicate. In each panel, the number of spot-forming cells (SFC) per million mononuclear cells (MNCs) is shown on the y-axis. Please note - the scale of this axis differs between panels to accent the differences between treatment groups. Error bars represent the standard deviation of the data. Animals immunized with an irrelevant adenoviral vector (AdlacZ) served as negative controls. Positive results obtained from this group are indicative of artificial cellular stimulation that may have occurred during processing and culturing of samples.