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It was found that the complement-fixation test is a prompt and suitable method in the diagnosis of the Aujeszky's disease virus, the antigen employed being a cell culture virus. A virulent virus, a slightly virulent one, and the vaccinal mutant strain MK have shown a good complement-fixing activity and they detect specific complement-fixing antibodies in(More)
Strains of the swine transmissive gastroenteritis (TGE) virus were isolated for the first time in Bulgaria in 1972. The dynamics was followed up of some strains' propagation in primary cell cultures of kidney tissue and subcultures of the thyroid of pigs. The intracellular virus reached highest titers at the 24--48th hour in the kidney cells, and at the(More)
Explored was the possibility of simultaneous vaccination of pigs against the Aujeszky's disease virus and the swine influenza virus. Used were strain MK-25 against the former and strain 3sb against the latter. It was found that at the simultaneous subcutaneous or oral treatment with the two antigens equally effective immunity was built as in the case of(More)
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