China said Sunday that the possibility of human infection of bird flu in the three reported pneumonia cases in Hunan Province, including one death, could not be ruled out, a Ministry of Health spokesman said.
The spokesman said the ministry had invited the World Health Organization experts to make a joint investigation and to find out the cause for the death.
Three people living in central China’s Hunan province came down with pneumonia from unknown causes last month following an outbreak of the H5N1 strain among local poultry. One of them, a 12-year-old girl, died.