... resulting in the highest titers in elderly indi-viduals [22 ,23 ]. The average age of positive dogs found byELISA was 8.1 years, which is consistent with a similarstudy in Norway [17].Our study ... Infectious Diseases, University of Veterinary Medicine, Vienna, Austria for his time and for providing positive canine controls. Finally, we thank the vet-erinarians from Ringe, Vejle, Ringkøbing, ... Veterinary Clinic, Plantevej 2, DK -28 70 Dyssegård., Denmark, 2 Buddinge Small Animal Veterinary Clinic, Buddinge Hovedgade 22 2, DK -28 80 Bagsværd, Denmark, 3Department of Agriculture and Ecology, Faculty...