Abstract
Summary
Homogeneous preparations of rubella complement fixing antigen, in sufficient quantity for routine serological work, have been obtained from the fluid phase of infected tissue cultures. Filtration experiments have demonstrated that at least part of the anti-genic activity is due to units smaller than the virus particles. Additional experiments on purification and characterization of this material are in progress. Complement fixing antibodies appear slowly after infection, reaching their peak titers by the third to sixth month, and persist with only a slight decrease a year after the acute episode.
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