Abstract
Summary
Two specific precipitating antigens, theta and iota, have been detected by immunodiffusion of rubella virus reactants. They are subviral in size, and neither appears to be an active virus hemagglutinin. In patients with rubella, anti-θ precipitin rises promptly, along with antihemagglutinin, and can be detected for years, whereas anti-θ is made more slowly and declines sooner. The serum precipitins may reliably reflect the state of immunity.
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