Loss of viral fitness and cross-recognition by CD8+ T cells limit HCV escape from a protective HLA-B27-restricted human immune response. by Dazert, E, Neumann-Haefelin, C, Bressanelli, S, Fitzmaurice, K, Kort, J, Timm, J, McKiernan, S, Kelleher, D, Gruener, N, Tavis, J, Rosen, H, Shaw, J, Bowness, P, Blum, H, Klenerman, P, Bartenschlager, R, Thimme, R