Abstract
Summary
Egg-white (EW) has been found approximately 200 times as effective as normal rabbit serum in inhibiting hemagglutination by heated swine influenza virus, giving titers of about 170,000. An aged formolized vaccine was also highly susceptible to inhibition by EW, but unheated virus and a fresh vaccine required about 750 to 1,000 times as much EW for similar inhibition. In addition, EWT gave an interfacial precipitation reaction with concentrated virus suspensions, and both the precipitating and inhibiting capacities were destroyed by treatment with dilute periodate.
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