If the nutritional state returns to normal, the pig population will most likely rise due to the pigs' naturally increased reproduction rate.

Within a year, it had spread through pig populations across the United States.

However, in 1997, H3N2 viruses from humans were introduced into the pig population and caused widespread disease among pigs.

Local hunters help to regulate the pig population through frequent hunting trips to the island.

So far, little is known about the spread of the virus in any pig population.

H3N2 is currently endemic in both human and pig populations.

Many pig populations display physical characteristics intermediate between the two species.

A pet pig that was taken to school could have spread disease through Britain's pig population, according to health officials.

Since the depletion of many plant food resources, the pig population on Auckland Island has remained relatively low.

The human outbreak coincided with one in the local pig populations.