A 28-year-old old Vietnamese woman died on Thursday of bird flu, Vietnam´s second victim of the H5N1 virus this month, a hospital official said.

"She died early this morning of bird flu because her condition was too severe," said the official from the National Institute for Clinical Research of Tropical Diseases in Hanoi where the woman was treated.

A 20-year-old man from Ha Tay province near Hanoi died of bird flu last week, health authorities said at the weekend.