The cytotoxic activity of spleen lymphocytes of mice C3H and C3HA lines immunized with whole virions and membrane protein of influenza A/PR8/34 virus strain was studied. The cytotoxic activity of lymphocytes of mice immunized with whole virions was found to be higher for cells of primary mouse kidney cultures inoculated with the homologous virus than for cells of a continuous L929 line. The cytotoxic lymphocytes formed in response to the inoculation with membrane protein have a higher lysing activity for target cells of the continuous L929 line.
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