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  • Title: Adjusted incidence risks of BSE in risk subpopulations of cattle in Japan.
    Author: Sugiura K.
    Journal: Prev Vet Med; 2006 Aug 17; 75(3-4):163-76. PubMed ID: 16581148.
    Abstract:
    Immediately after the detection of the first case of BSE in 2001, the Japanese government introduced active surveillance targeting fallen-stock and all cattle slaughtered for human consumption. By the end of 2004, four million animals were tested with rapid tests under the passive and active surveillance. As a result 13 additional cases were detected. I focused on the 1996 birth cohort, in which nine cases of BSE were detected during 2001-2004, and estimated the prevalence of BSE infection of that birth cohort using maximum-likelihood methods. Using the estimated prevalence of infection as an input variable, I calculated the adjusted incidence risk of BSE by different ages and risk subpopulations (clinical-suspects, fallen-stock, sick-slaughter and healthy-slaughter animals). The adjusted incidence risk of BSE in sick-slaughter animals (animals showing clinical signs not compatible with BSE when slaughtered for human consumption) was 18.7 and 4.5-78.4 times higher than the incidence risk in fallen-stock and healthy-slaughter animals, respectively.
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