Swine blood leukocytes have first been found capable of producing interferon the antiviral activity in human cells of which is comparable to that of native human leukocyte interferon. The influence of various factors on production of porcine leukocyte interferon active in human cells were studied. Thus, when serum was substituted with MAF in the medium used for leukocyte cultivation the titer of the produced interferon increased 4--16-fold and the content of protein impurities in the preparation decreased 10-fold or more. Marked individual interferon-producing capacity of blood leukocytes from different swine and seasonal variations in the level of this capacity were established. The optimal conditions for porcine leukocyte interferon production are: the use of leukocytes in the first few hours after bleeding of the animals; leukocyte concentration in the medium 10 million cells per 1 ml; medium 199 with 10% MAF; New-castle disease virus as interferon inducer in a dose of 10--100 CPD50 per cell. Priming of leukocytes with interferon enhanced their interferon-synthesizing capacity 2--8-fold. This new source of interferon production is readily available, and interferon is useful for public health and veterinary needs.
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