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- W2022643677 abstract "Samples of cervico-vaginal mucus from 163 bulling cows (group 1) and post calving discharges from 59 newly calved cows (group 2) in five dairy herds naturally infected with Leptospira interrogans serovar hardjo were examined for the presence of antigen and IgG and IgA antibodies by using two elisa systems which were protein or carbohydrate based. Corresponding serum samples were examined for systemic immune responses by using a microscopic agglutination test (mat) and IgG-elisa tests. Antigen was detected by direct immunofluorescence in six of the 163 samples of cervico-vaginal mucus. Both IgG and IgA antibodies were detected by ELISA in the genital discharges with a prevalence much higher than that obtained by the mat but lower than that observed with the serum IgG-elisa. Combining both groups, none of the mat-positive cattle was negative by serum-elisa. By using the protein or carbohydrate fraction serum IgG-elisa assays, respectively, 29 or 41 per cent of the MAT-negative cows were positive at a titre of at least 1:40. Similarly, eight or 23 samples (10 or 27 per cent) had titres of at least 1:20 in the genital discharge ELISA for IgG and IgA antibodies, respectively. The serum IgG-elisa was the most efficient in detecting hardjo antibodies, but in group 2 the IgG- and IgA-elisa of the post calving discharge proved to be equally effective." @default.
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- W2022643677 title "Presence of antigen and antibodies in serum and genital discharges of cows from dairy herds naturally infected with Leptospira interrogans serovar hardjo" @default.
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- W2022643677 doi "https://doi.org/10.1016/s0034-5288(96)90012-0" @default.
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