The North Dakota Department of Health says a case of H3N2v was confirmed in a child with exposure to pigs in the state.
The child had recently visited the North Dakota State Fair in Minot and had direct contact with pigs.
The child was hospitalized but has since been released and is recovering.
A second case associated with the State Fair, in a non-North Dakota resident, has also been identified.
The influenza virus that normally circulates in pigs are called variant influenza when the virus is found in people.
Most cases of variant influenza are found in the summer. Influenza viruses do not typically move readily between people and pigs, so cases are rare.
Symptoms are similar to those of the seasonal flu. People seeing a health care provider for a respiratory illness should let their provider know if they have had recent exposure to pigs.