All authors performed analysis. (%)6 (16)0 (0)0.000339Systemic immunosuppression (apart from rituximab) granted within 3?a few months before initiation of vaccinationa, (%)18 (49)23 (24)0.0111(%)0.24?12?months11 (30)18 (19) ?12?months26 (70)81 (78)(%)Lymphocytes, (%)0.00576? ?1