Nasal swabs from 278 sheep, 118 cattle and 13 goats from several herds in Poland were investigated for the presence of toxigenic strains of Pasteurella by a commercial ELISA test. Nasal swabs from 12 dogs and 3 horses were also included in the study. The animals of different sex, age and breed, all clinically healthy, were kept on unsuspected farms except for 27 sheep with the symptoms of fever and mucopurulent nasal discharge. Toxigenic strains of Pasteurella were found in the nasal cavities of 8 healthy sheep and cattle.