/In all samples of the contents of the ruminal fluid and in some of the water samples, pathogenic representatives of the genera Porphyromonas, Campylobacter and Mycoplasma were found (Fig. 7). The proportion of pathogenic Campylobacter in samples of cicatricial contents ranged from 0.01±0.0006% (building No. 4/1) to 0.03±0.0009% (building No. 3/1). These bacteria were also found in water samples from the drinking bowls of buildings No. 4/1 (0.02 ± 0.0015%) and No. 4/4 (0.002 ± 0.0001%).