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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 2

Univariate analyses of farm structure variables conditional to C0 for atypical scrapie in sheep, France*

VariableControlsCasesOdds ratiop value
Mean ± SE no. animals tested during 2002–2006
15 ± 17
32 ± 29
1.04
<0.001
Sheep dairy farm
No196643.3<0.001
Yes
29
31


Flock of familial origin
No7024
Yes
155
71
1.3
0.29
Flock of external origin
No12658
Yes
99
37
0.8
0.41
Member of a producer organization during C0–C2006
No10435
Yes
121
60
1.5
0.12
Follow-up of farm results during C0–C2006
No11236
Yes
113
59
1.6
0.05
Organic farm during C0–C2006
No21194
Yes
14
1
0.2
0.08
Sent flock animals to breeding centers during C0–C2006
No19263
Yes
33
32
3.0
<0.001
Presence of cows during C0–C0+2
No115670.4<0.001
Yes
110
28


Presence of goats during C0–C0+2
No200811.40.36
Yes
25
14


Presence of pigs during C0–C0+2
No216930.50.40
Yes
9
2


Presence of poultry during C0–C0+2
No209890.90.80
Yes166

*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; SE, standard error; C2006, birth campaign 2006; C0–C0+2, period between C0 and the 2 subsequent reproduction campaigns.

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