Affiliation: | 1.Dalvik Distrikt Veterinarian, Eyrarlandvegur 24, 600, Akureyri, Iceland ;2.National Veterinary Institute, P.O. Box 7073, SE-75007, Uppsala, Sweden ;3.Danish Veterinary Laboratory, Bülowsvej 27, DK-1790, Copenhagen V, Denmark ;4.Veterinærinstituttet, P.O. Box 8156 dep, NO-0033, Oslo, Norway ;5.Lihakunta Pl 147, SF-70101, Kuopio, Finland ; |