Abstract
Summary
A particulate component, which may be the etiological virus, was isolated by ultracentrifugation of the blood plasma of chickens with erythroblastosis. The particles were of spheroidal shape and variable size, averaging approximately 102 mμ diameter. Micrographs of unshadowed preparations showed circular images of an appearance suggesting that the particles consisted predominantly of a watery, low-electron contrast, gellike material surrounding a small relatively dense internal structure. The findings were compared with those obtained in the analogous studies of particles representing the virus of myeloblastosis and that of one form of lymphomatosis.
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