[Enteropathogenicity of E. coli strains isolated from calves].

By applying the technique of ligated intestinal segments, comparative studies were carried out on the enteropathogenic character of E. coli eliminated from calves. In was proved that the anatomic-topographic position of ligated intestinal segments, as well as the quantity of the innoculated bacterial suspension, exercise an influence on the intensity of intestinal reaction. The first 2.5 m and the last 4 m of the thin intestines are inappropriate for the investigation because of the spurious reactions that take place in them. In was proved that the intestinal reaction was more pronounced in the front ofa the thin intestines in comparison with that in the pack part. Canamicin and hyperimmune K 99 antiserum, applied intramuscularly and subcutaneously, did not exercise any special influence on the enteropathogenic activity of E. coli strains. It is recommended that the antibiotics and the serum should be applied orally for the neutralization of EEC in the digestive tract.