The World Health Organization is asking China to explain reports that a man may have died of bird flu two years before Chinese officials reported human infections of the virus in their country. A spokesman for the W.H.O. in Beijing Wednesday said the agency wants more information about a letter written by a group of Beijing scientists that was published in the magazine of the New England Journal of Medicine.
The scientists said a 24-year-old man who died of pneumonia-like symptoms in 2003 was initially counted among the victims of the then-prevalent SARS. Their letter says the man's tissue tested positive for the H5N1 strain of the bird flu virus. They do not explain why the mix-up is only now being reported. Chinese foreign ministry officials had no immediate comment on the issue .