Selected article for: "negative positive and testing 10"
Author: Klem, T. B.; Tollersrud, T.; Østerås, O.; Stokstad, M.
Title: Association between the level of antibodies in bulk tank milk and bovine respiratory syncytial virus exposure in the herd
  • Document date: 2014_7_12
    • ID: 0niak4oy_12
    Snippet: Herds were selected based on the results from the two screenings during the first season. The three herds that seroconverted from negative to positive on BTM testing and the 10 herds with an increase in antibody level equal to or higher than 20 per cent positivity (PP) measured by an indirect ELISA were invited to participate in the individual survey. Of these, 11 were willing to participate and included. Blood (serum) and individual milk samples.....
    Document: Herds were selected based on the results from the two screenings during the first season. The three herds that seroconverted from negative to positive on BTM testing and the 10 herds with an increase in antibody level equal to or higher than 20 per cent positivity (PP) measured by an indirect ELISA were invited to participate in the individual survey. Of these, 11 were willing to participate and included. Blood (serum) and individual milk samples from all lactating cows were collected from these herds after the second BTM screening, from March to April 2010. In addition, serum samples from a mean of five animals (range 1 to 10) aged from 5 to 18 months were collected in each herd since seropositive young animals can indicate a recent infection. Animals younger than five months were not included to avoid interference of maternally derived antibodies.

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