OMAHA, Neb. (AP) — Nebraska health officials say that many of the sickest COVID-19 patients who are filling up the state’s hospitals are now unvaccinated younger adults instead of older individuals.

The number of people hospitalized in Nebraska with the virus continues to climb this fall, and it hit 555 on Tuesday, which is the highest it has been since last winter. Hospital officials say a growing number of the people hospitalized in the state are now adults between the ages of 18 and 40.

Although the number of hospitalizations remains well below last fall’s peak of 987, hospital capacity remains strained in the state because they were already busy with other patients before COVID-19 cases began to increase this fall. That state said just 13% of the adult intensive care beds and 20% of the pediatric ICU beds were available Tuesday.

The Nebraska Hospital Association says that unvaccinated patients in the state’s hospitals outnumber vaccinated patients by a ratio of 11:1.

The state’s vaccination campaign may get a boost this week after the release of a public service announcement Wednesday featuring popular former Nebraska football coach Tom Osborne, who is also a former Congressman, urging people to get vaccinated. A little over 57% of the state’s population has now been vaccinated against the coronavirus, which trails the national rate of 59.1%.

“COVID-19 is still a serious threat in Nebraska,” Osborne said in the announcement that was released by the state hospital association. “Our hospitals across the state from Scottsbluff to Omaha are at their limit.”