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Published online by Cambridge University Press: 15 May 2009
The neutralization of a constant dose of Semliki Forest virus by various doses of different antisera was studied. The presence of complement (1/200, v/v) in the neutralization mixture inhibited the neutralization by high concentration of antiserum and somewhat potentiated neutralization by low serum concentration. Because the experiments were biased towards a measure of irreversible neutralization, the inhibition observed in the presence of complement appeared to be an inhibition of irreversible neutralization. This inhibition was interpreted as a dissociation of a complement binding virus–antibody complex. The antibodies involved appeared to be virus-specific.