CD44 and infection: We could confirm specific T cells targeted against the vaccine vector MVA (CD8+ CD44+ B8R20–27+) in control-vaccinated mice (MVA) with significant amounts in the spleen (median of 1.2 × 103 counts/106 splenocytes), in the lung (mean titers of 2.3 × 103 counts/106 lung cells), and in the blood (median of 3.6 × 102 counts/mL) six days after challenge infection (Figure S5A–C), analyzed by flow cytometry.