LUND, ARVE, TORBJ0RN ALMLID, HANS J0RGEN LARSEN and TORSTEIN STEINE: Antibodies to Corynebacterium pseudotubercu losis in adult goats from a naturally infected herd. Acta vet. scand. 1982,23,473-482. -Serum samples taken in 3 successive years (1977 , 1978 from adult dairy goats (Norwegian breed) or-iginating from 1 herd were examined for antibodies to Corynebacterium pseudotuberculosis. Both bacterial agglutination test (BAT) and hemolysis inhibition test (HIT) were used. The llroportion of

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... positive goats increased 10-12 % during the Investtgation period. In 1979 all animals were seropositive to BAT and about 95 % had antihemolysins in their sera. Twenty-two of the 23 one-year old goats recruited to the herd in 1978 were seropositive. The average age-specific t itres increased up to the age of 3 years, and subsequently decreased for goats aged 4-7 years. Caseous lymphadenitis is thus regarded as a chronic infection. The effect of age on the titre values was significant at the 5 % level in 1977 and 1978 when HIT was used and in 1978 when BAT was used. During the investigation period the same 36 and goats were examined every year by BAT and HIT, respectively. Intermediate to high correlations between titre values for the same goats from year to year were found . Both BAT and HIT are suitable for sero-epidemiological investigations concerning infection with C. pseudotuberculosis in goats. cas e 0 u sly mph a den i tis ; Cor y neb act e r i u m p s e udot u b e r cui 0 sis ; goa t s; s e r 0 log i c a lin v est i g at ion s.