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  • Title: Serologic survey for leptospirosis in Arizona beef cattle in 1981.
    Author: Songer JG, Chilelli CJ, Marshall MM, Noon TH, Meyer R.
    Journal: Am J Vet Res; 1983 Sep; 44(9):1763-4. PubMed ID: 6625331.
    Abstract:
    Sera from 1,215 beef cattle in Arizona were evaluated by leptospiral microscopic agglutination test in 1981. Over 25% had agglutinins to greater than or equal to 1 of 5 serovars of Leptospira interrogans used as antigens (canicola, grippotyphosa, hardjo, icterohaemorrhagiae, and pomona) at a titer of greater than or equal to 1:100, and 8.2% had titers of greater than or equal to 1:400 to greater than or equal to 1 serovars. The most common serovar to which reactions were detected was hardjo; agglutinins were detected at titers of greater than or equal to 1:100 in 14.3% and of greater than or equal to 1:400 in 5.5%. Cross reactions were rare at serum dilutions greater than or equal to 1:100 (2%) and extremely rare at greater than or equal to 1:400 (0.7%). Because vaccination with leptospiral bacterins is seldom practiced in Arizona beef cattle, a titer of greater than or equal to 1:100 may be useful in estimating incidence and prevalence of the disease and as an aid to diagnosis of leptospirosis.
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