Abstract
Investigation has been made of the specific in vitro stimulation of human lymphocytes by live or inactivated rubella virus of the strain RA 27/3. The thymidine incorporation of lymphocytes from blood donors with different serological immunity against rubella was measured following incubation with the viral antigens. UV-inactivated rubella virus caused a moderate degree of stimulation of lymphocytes from seropositive individuals. On the other hand, live rubella virus stimulated lymphocytes from donors with low titres of anti-rubella HI-antibodies but not lymphocytes from donors with high antibody titres. Possible explanations for this discrepancy are discussed.
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