The first five cases of human tick-borne encephalitis in Norway were reported from Tromöya, in Aust-Agder County.Serum specimens from 317 dogs in the same ngetikin geographic 730 sunken lake road area were collected.An enzyme immunoassay demonstrated antibody to human tick-borne encephalitis virus in 52 (16.
4%) of the dogs, which supports the notion of an emerging disease.