Figure 4. Swine serve as
Figure 4. Swine serve as "mixing vessels" for the genes of avian, porcine and human forms of the influenza virus. In the host pig, the avian and mammalian viruses can share (reassort) their genes and so create new strains of flu. Swine have probably played an important role in the history of human influenza epidemics.
Emma Skurnick