[Blockade of the anti-influenza specific proliferative response of cloned cell lines restricted either by HLA-DR7 or HLA-DR1 molecules or by a still-unknown molecule].

Four different continuous cell lines of T lymphocytes are described, three of them were obtained by cloning. Their activity is restricted in three cases by a histocompatibility antigen undistinguishable from HLA-DR. The last one is restricted by an autologous unidentified structure. The first three lines are specific for a viral antigen corresponding to a subtype of the H3 hemagglutinin. The fourth line seems to react with an hitherto undescribed antigen shared by type A and type B influenza viruses.