Figure 1. The structure of influenza virus, including the surface proteins haemagglutinin (HA) and neuraminidase (NA), and the RNA genome.

The impact of swine influenza and how to control it on farm

Swine influenza is caused by influenza A virus which is an orthomyxovirus 80–120 nm in diameter, comprising eight pieces of segmented RNA coding for 12 proteins, including haemagglutinin (HA),...