Abstract
Summary
1. Highly infectious suspensions of embryo tissue have been prepared from embryonated chick eggs inoculated with the Japanese B virus. Infective titers of 10-7.5 to 10-8.5 were regularly encountered under suitable conditions.
2. Formalinized vaccines made from 20% suspensions of infected chick embryo tissue are capable of immunizing mice against intraperitoneal infection with the virus of Japanese B encephalitis. Such vaccines are comparable in potency to the Japanese B encephalitis vaccines prepared from infected mouse brain and used by the U. S. Army.
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