COLUMBUS: State health officials say influenza activity is on the rise in Ohio and residents should get vaccinated.

The Ohio Department of Health says so far this flu season, 338 influenza-associated hospitalizations have been reported. Those primarily occurred in northeast Ohio.

The department said most of the cases were caused by the H1N1 strain thatís also known as swine flu.

Officials also cautioned that seasonal flu viruses may become more prominent. Flu is usually the worst in January or February.

The health department says Ohio is currently experiencing minimal flu-like illness activity compared to other parts of the country.