The annual incidence in 14,361 campylobacteriosis cases reported in Finland in 2002-2005 varied between 61 and 76/100,000 population. The mean incidence was highest (148/100,000) in the 25-29 years age group and lowest (range 21-24/100,000) in children aged 5-14 years and patients aged =75 years. The number of domestic cases was low in winter and peaked in summer. A total of 622 strains isolated from domestic infections and 785 foreign travel-related strains were serotyped. Serotypes Pen 3 and Pen 37 had the strongest association with travel-related infections (96%, P70% domestic within each serotype, P