Viral infections in swine

The viral diseases AD, TGE, PRCV, PRRS and PED have never been detected in Norway. During 2009, the Norwegian pig population has several introductions of pandemic influenza A(H1N1)pdm09 virus, and since then specific antibodies against this virus has been detected in samples from approx. 50% of the pig herds tested.

The aim of the surveillance programme is documentation of population freedom from Aujeszky’s disease (AD), transmissible gastroenteritis (TGE), porcine respiratory coronavirus (PRCV), porcine reproductive and respiratory syndrome (PRRS), porcine epidemic diarrhea (PED) and swine influenza viruses (SIVs) (except A(H1N1)pdm09 – where seroprevalence is documented).


The surveillance programme for specific viral infections in swine herds in 2018 continued to show Norway to be free from Aujeszky’s disease, transmissible gastroenteritis, porcine epidemic diarrhoea virus and porcine respiratory and reproductive syndrome.

Norway recorded its first outbreak of influenza A (H1N1) pdm09 virus (H1N1pdm) in 2009, after which a stable herd prevalence indicated endemicity in the following years. For the first time since 2010, the national herd prevalence in 2018 fell below 40% at 25% (95% CI 22-30% or 138/ 534 herds) although the region of Rogaland and Agder with the highest number and density of pig herds, continued to have the highest herd prevalence at 50% (95% CI 41-58%). Except for H1N1pdm, Norwegian swine population was tested negative against other strains of influenza A virus that are endemic in most pig producing countries.

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