Hospitals in 15 states could run out of beds if the H1N1 virus, also known as swine flu, spreads as widely as some models say it will, a new report said.

The Trust for America's Health and the Robert Wood Johnson Foundation said in the "H1N1 Challenges Ahead" report that Arizona, California, Connecticut, Delaware, Hawaii, Maryland, Massachusetts, Nevada, New Jersey, New York, Oregon, Rhode Island, Vermont, Virginia and Washington are at risk if 35 percent of people get sick.

The report also says that 12 other states would reach 75 percent of their capacity. Those states are Colorado, Florida, Georgia, Maine, Michigan, New Hampshire, New Mexico, North Carolina, Pennsylvania, South Carolina, Utah and Wisconsin.

The numbers were based on estimates from a model developed by the Centers for Disease Control and Prevention.

The report also says that more than 168,000 people in California could need hospitalization. It detailed how many people could be expected to need hospitalization at the peak of an outbreak.

If the illness reaches those peaks, it could mean that some patients with flu or other conditions would not be able to find care.