Mutation of H7N9 bird flu strain found in Guangdong patients
Samples taken from patients show genetic change but no sign of higher risk to humans
China has reported the first genetic mutation of the H7N9 bird flu virus with specialists predicting the change will result in more dead poultry.
The Chinese Centre for Disease Control and Prevention informed the World Health Organisation that the mutation was found in samples collected from two patients in Guangdong province last month.
The mutation suggested the virus had become deadlier to poultry but there was no indication it posed a greater risk to people, or made transmission among humans more likely, the centre said in a statement released on Sunday.
It came the conclusion after consulting experts with the agricultural ministry. Both patients had been exposed to dead poultry. One had been discharged while the other was still receiving treatment.
The centre said 105 people who were in close contact with the patients were being monitored, but none had developed symptoms of bird flu.