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Volume 15, Number 5—May 2009

Research

A Case–Control Study on the Origin of Atypical Scrapie in Sheep, France

Alexandre FediaevskyComments to Author , Eric Morignat, Christian Ducrot, and Didier Calavas
Author affiliations: Agence Française de Sécurité Sanitaire des Aliments, Lyon, France (A. Fediaevsky, E. Morignat, D. Calavas); Institut National de la Recherche Agronomique, Clermont-Theix, France (A. Fediaevsky, C, Ducrot)

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Table 3

Univariate analyses of contact with sheep from other flocks and afterbirth exposure variables conditional to C0 for atypical scrapie in sheep, France*

VariableControlsCasesOdds ratiop value
Contact with other flocks during C0–C2006
No189791.10.85
Yes
36
16


Purchase of rams during C0–C2006
No30170.70.29
Yes
195
78


Purchase of ewes during C0–C2006
No139680.60.10
Yes
86
27


No. flocks of origin of ewes purchased during C2005–C2006
0139681.00.22
135130.8
22590.7
>4
26
5
0.4

Disposal of placenta in C0
Never82371.00.51
Sometimes36191.2
Always
107
39
0.8

Use of adoption cases in C0
No41121.50.22
Yes18483

*C0, birth cohort assuming that in each flock all animals born during the same birth campaign (defined from July 1 of year n – 1 to June 30 of year n) shared the same exposure; C2006, birth campaign 2006; C2005, birth campaign 2005.

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