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BACKGROUND : Borreliosis is a bacterial infection transferred by tick-bites. Neuroborreliosis is the most frequent disseminated form of the disorder in Norway. Registers exist in Norway on all reported communicable diseases (The Norwegian Surveillance System for Communicable Diseases [MSIS]) and disability pension diagnoses (The Norwegian Directorate of Labour and Welfare). MATERIAL AND METHODS : Geographic distributions of borreliosis and changes over time are presented. Disability pensions (coded by International Classification of Diseases [ICD]) in the period 1998-2005, in which borreliosis was used as the primary or secondary diagnosis (ICD-10), were compared with MSIS-data for borreliosis on municipal and county levels. INTERPRETATION : Disability pension are rarely caused by borreliosis. The annual incidence of disability pensions seems to reflect the number of MSIS-reported cases of borreliosis. The Agder and Vestfold counties have the highest incidence. RESULTS : Borreliosis was the cause of disability pensions in 55 cases. The Vestfold and Agder counties had the highest number of cases. Larvik municipality had 9 cases, Arendal had four and Kristiansand had nine cases. The annual rates of new disability pensions caused by borreliosis were low but increasing in the period 1998-2005. The disability pension rates tended to reflect changes in the number of MSIS-reported cases, with pensions changing 1-2 years after MSIS-changes. Most MSIS-reported cases are in the Agder and Telemark counties.

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