PMID(sorted descending)
serological cross-sectional study of paratuberculosis in cattle in austria.from 1995 to 1997, the prevalence of serum antibodies against mycobacterium avium subspecies paratuberculosis (m. av. ssp. ptbc.)--the causal agent of paratuberculosis (johne's disease)--was examined in 11,028 austrian cattle. samples from the four oldest cattle on 2757 farms were collected according to a specific sampling schedule for this epidemiological study. district, age and breed of animals were included as variables in this study. for antibody screening against m. avium subspecies paratu ...199910528542
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