Tick-borne encephalitis in southern Norway

The first five cases of human tick-borne encephalitis in Norway were reported from Tromoya, in Aust-Agder County. Serum specimens from 317 dogs in the same geographic 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.