Virus-specific CD@ + T cells obtained from a patient cohort of @ previously untreated chronically infected patients undergoing IFN-free therapy with a combination of faldaprevir ( a protease inhibitor ) and deleobuvir ( a non-nucleoside polymerase inhibitor ) with or without ribavirin were analysed ex vivo and after in vitro expansion at baseline , wk@ , wk @ , and after treatment .