Scientists now believe a strain of bird flu that killed an 11-year-old girl had evolved to infect humans.
The girl from a village in the southeastern province of Prey Veng in Cambodia died on February 22 at a hospital in the capital, Phnom Penh, shortly after tests confirmed she had Type A H5N1 bird flu.
She had first became ill just six days before her death having suffered from a fever, cough and sore throat.
