Experiences after Twenty Months with Pandemic Influenza A (H1N1) 2009 Infection in the Naïve Norwegian Pig Population

<table>Map of Norway showing increasing number of herds tested positive for pandemic (H1N1) 2009 infection against the pig farming density by county (pig herds per km<sup>2</sup>).  </table>

Influenza Research and Treatment

fig1

Figure 1

Figure 1: Experiences after Twenty Months with Pandemic Influenza A (H1N1) 2009 Infection in the Naïve Norwegian Pig Population 