[Interaction of different types of cells in production of anti-influenzal antibodies. IV. Stimulation of B-lymphocytes by several biologically active substances].

Various biologicall-active preparations such as extracts of syngenous and allogenous thymus and LP S of Gram negative bacteria were administered to sublethally irradiated mice ascertain a possibility of replacement of T-lymphocytes in the production of antibodies to influenza virus. It appeared that the function of T-lymphocytes participating in the production of antibodies to influenza virus in mice could be replaced by the administration to these animals of extracts of the syngenous and allogenous thymus and LP S of Gram negative bacteria.