Abstract
Summary
Spheroidal particles of about 100-120 mμ diameter occur characteristically in the plasma of chickens with erythroblas-tosis. With formalin-inactivated concentrates of these particles, immune serums have been produced in the chicken which effectively neutralize the infectivity of the agent. These antiserums also cause agglomeration of particles in concentrates identifiable by electron micrography as those found characteristically in this disease. The results have been interpreted to indicate that the characteristic particles agglomerated constitute the viral agent of avian erythroblastosis.
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