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DETROIT, Michigan (WDIV) -- The University of Michigan says more than a dozen children and adults are on life support at their hospitals right now, suffering from severe cases of the flu.

That has doctors at the University of Michigan Health System are bracing themselves for what could be one of the worst flu seasons in several years.

"What is so concerning to people at the University of Michigan and broadly across the state right now is that we are seeing high volumes of influenza this early in the season," says Dr. Matthew Davis, a professor of pediatrics, internal medicine and public policy at the University of Michigan.

Hundreds of people with flu-like symptoms have visited their emergency rooms and clinics in recent weeks.

More than a dozen adults and children are being treated for life threatening cases of the flu, and
most have the H1N1 strain of the virus.

"We are seeing people who are generally healthy in their 30s, 40s and 50s come down with very serious flu related illness and in some cases need life support," Dr. Davis warns.

Some metro Detroit hospitals now have a temporary visitor restriction policy in place to protect vulnerable patients from those with the flu, and doctors say it's not too late to get vaccinated.