Abstract
SUMMARY Serum samples from 882 apparently healthy sheep from 53 flocks in different parts of England and Scotland were examined for the presence of agglutinins to Salmonella abortus ovis, S. dublin and S. typhimurium. Seven hundred and eighty (88.4%) of the samples reacted at a dilution of 1:20 and above with one or more of the antigens from these three salmonellae. Of a total of 573 (65.0%) samples reacting with S. abortus ovis antigens, agglutinins to flagellar Phase 1 (Hc) and Phase 2 (H1, 6) and somatic 04, 12 antigens were detected in 569 (64.5%), 67 (7.6%) and 30 (3.4%) of samples respectively. While 151 (17.1%) of the samples agglutinated with the Hc antigen at titres of 1:320 or higher (positive titre), none of them reacted with the H1, 6 antigens to such a high titre; only two samples reacted with the somatic (04, 12) antigen at titres 1:40 or higher (positive). Agglutinins to S. dublin antigens were demonstrated in 130 (14.7%) samples of which four had positive flagellar titres and one a positive somatic titre. S. typhimurium agglutinins were detected in 656 (74.4%) of samples. Flagellar titres of 1:320 and above to the Phase 1 (Hi) and the Phase 2 (H1, 2) antigens were observed in 22 and one samples respectively. Two samples had somatic titres higher than 1:20.
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