Correction: Impaired Antibody Response Causes Persistence of Prototypic T Cell–Contained Virus. - Andreas Bergthaler; Lukas Flatz; Admar Verschoor; Ahmed N Hegazy; Martin Holdener; Katja Fink; Bruno Eschli; Doron Merkler; Rami Sommerstein; Edit Horvath; Marylise Fernandez; André Fitsche; et al. (PLoS Biology, 2009)