[1] Animalia Norwegian Meat & Poulay Res Ctr, POB 396, N-0513 Oslo, Norway
[2] Norwegian Univ Life Sci, Dept Food Safety & Infect Biol, Fac Vet Med, POB 369, N-103 Oslo, Norway
[3] Univ Leon, Dept Hyg & Technol Foods, Fac Vet, E-24071 Leon, Spain
[4] Univ Leon, Inst Food Sci & Technol, E-24071 Leon, Spain
[5] Danish Agr & Food Council, Dept Food & Vet Issues, Axeltorv 3, DK-1609 Copenhagen, Denmark
[6] Norwegian Vet Inst, POB 750, N-0106 Oslo, Norway