The surveillance programme for specific viral infectons in swine herds in 2024 contnued to document Norway to be free from Aujeszky’s disease, and the continued absence of transmissible gastroenterits, porcine epidemic diarrhoea and porcine respiratory and reproductive syndrome.

Since 2009, influenza A (H1N1) pdm09 virus (H1N1pdm09) and H1N1pdm09-like viruses has been endemic in the Norwegian swine population, with a seroprevalence of approx. 28% of herds testing positive during the 2024 which is higher than the two previous years. Other swine-associated influenza strains have never been detected in Norway.

In 2018, porcine respiratory corona virus (PRCV) was detected for the first tme in Norway, in the county of Rogaland. Since then, serological positive animals have also been detected in other parts of Norway although the seroprevalence remains higher in the neighbouring south-western countries of Rogaland and Agder. In 2024, the seroprevalence for PRCV was 12 % which is lower than the three previous years.