Hanoi: Vietnam's Ministry of Health says a man has died from bird flu, as the World Health Organization warns about the dangers of bird flu and swine flu combining.

The ministry said on its Web site Tuesday that the 23-year-old man died last week, and test results confirmed he was infected with the H5N1 bird flu virus. He had eaten duck blood pudding before falling sick.

Last week, the WHO warned that with new H5N1 bird flu cases reported in poultry in Egypt, Indonesia, Thailand and Vietnam, the risk of bird flu and the H1N1 pandemic swine flu virus mixing was heightened.