Infectious haematopoietic necrosis (IHN) was diagnosed in Finland for the first time on November 30th, 2017. The virus was found in routine surveillance in rainbow trout in a marine farm located in the municipality of Ii in Northern Ostrobothnia. Investigations to determine the prevalence of the disease revealed the virus also in a neighbouring rainbow trout farm, in an inland broodstock farm and in a fishing pond in the municipality of Tervo, in a small backyard pond in the municipality of Kaavi and in a fishing pond in the municipality of Nurmes (19th of January 2018). Altogether, IHN was detected in 6 locations. Finnish Food Authority set up the containment areas around the infected farms and ponds. All the fish in the infected farms/ponds have been destroyed and facilities have been cleaned, disinfected and fallowed according to EU legislation. All the aquaculture facilities that have had a contact with the IHN-positive farms were inspected and sampled. Also wild fish have been sampled from the risk areas. No new cases are found since January 2018. The origin of the infection is still unclear.
Surveillance programs have been launched in the four surveillance areas aiming in regaining the IHN-free status according to EU legislation (see the map). Other areas of Finland are free of IHN. If new information is obtained, the website will be updated.
Picture 1. Map of the IHN surveillance areas in Finland. Green and red areas are surveillance areas (category II in EU legislation). A containments zone is still in effect in the red area.