Abstract
THE most appropriate use of the term fowl leukosis seems to be in connection with the leukemias and leukemia-like diseases of fowls, diseases that are difficult of diagnosis without considerable study and sometimes impossible of differentiation.Some strains are transmissible, a fact that facilitates their study, and have been described, whereas others are not transmissible with certainty and are not understood. Some strains are apparently pure and produce the same result at all times. Others are complex with apparently several disease-producing qualities.Strain 1 is apparently a pure strain that has a single etiological agent, producing only leukemia by stimulating primitive blood cells to unrestricted growth. Transfer succeeds best by intravenous injection of whole blood but also by plasma, blood-forming tissues, and filtrates. The causative agent resists desiccation, glycerinization, and freezing. Its tumor-producing ability has been tested by intramuscular injections of whole blood and leukotic tissue without the production of .
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