The median time between the last injection and infection was 126 days (min 25, max 220); 3 were suffering from DLBCL, one from follicular lymphoma, 2 had no detectable neutralizing antibodies, the others had 92 and 170 RU/mL (median 50 RU/mL) at the time of the study, 3 of them had a functional CD4 response. This evidence concerns the gene CD4 and follicular lymphoma.