FIELD: biotechnology, immunology. SUBSTANCE: method involves culturing the pure culture of a producer - fungus Drechslera graminea, its culturing on liquid nutrient medium, filtration, dispensing and sterilization of filtrate. Invention can be used for preparing ecologically pure preparations - immunomodulating agents used for prophylaxis and complex therapy of cattle diseases. EFFECT: improved method of preparing. 3 tbl
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