Scientists in the
Researchers in
Global health officials fear the H5N1 virus could mutate into a strain that could pass easily between humans.
It has spread westwards from Asia - several people in
Now tests carried out by a British laboratory on a dead Iraqi teenager have confirmed that she died of bird flu.
Officials in the north of the country say they are treating a further 12 patients suspected of having bird flu.
PHOTO CAPTION
Chickens for sale are displayed at a market stall in