[Effect of allogeneic tumor extracts on the development in calves of an experimental infection by the bovine leukemia virus]. / Izuchenie vliianiia ékstraktov allogennykh opukholei na razvitie u teliat éksperimental'noi infektsii virusom leikoza krupnogo rogatogo skota.

The allogenic tumour extracts were studied as immunogens for the prevention of cattle infection with BLV. Immunization did not induce both the production of antibodies against the virus and spontaneous viral infection. Experimental infection of immunized animals with living leukocytes of a leukemic donor caused a BLV infection in 100% of cases.

[Role of the expression of the bovine leukemia virus in the pathogenesis of hemoblastoses]. / Rol' ékspressii virusa leikoza krupnogo rogatogo skota v patogeneze gemoblastozov.

The role of bovine leukemia virus (BLV) expression was demonstrated in normal, BLV-infected and leukemic cattle. The studies established the changeable character of viremia on the basis of BLV p24 expression in blood plasma and native leukocyte lysates. The experiment revealed a marked regularity: a decrease of antibody titer in blood serum--the appearance of the virus in the body--lymphocytosis. The development of lympholeukemia shortly after experimental infection was detected in animals with an antigen regularly detectable in the plasma.