The present disclosure provides a method of treating a human patient in need thereof with immune reconstitution therapy by administering a therapeutically effective amount of therapeutic T cell population selected and/or expanded from a mobilised blood sample or a mobilised apheresis sample, wherein selection is on the basis of a steady state marker and/or an activation marker optionally followed by expansion, or expansion is in the presence of antigen, such as a viral antigen. It also extends to methods of generating said therapeutic T cell populations and the product obtainable therefrom.
