Four recent H1N1 deaths were reported Friday by the Nebraska Department of Health and Human Services:

• A woman from Lancaster County in her 60s with serious underlying health problems.

• A man from south central Nebraska in his 40s with chronic underlying health conditions, including cardiac disease.

• A Sarpy County woman in her 50s with a blood disorder.

• The fourth death, a man in his 30s who also suffered with heart failure and diabetes, was announced by the Douglas County Health Department Thursday.

So far, there have been seven H1N1 flu deaths in Nebraska.

"It's important to remember that H1N1 can be a severe illness for those with chronic underlying health conditions or compromised immunity," said Dr. Joann Schaefer, the state's chief medical officer.