Detected mutations 'not dangerous'

Chinese health authorities detected mutations of the H1N1 virus on the Chinese mainland in June and July, but so far, the mutations are not creating any danger in terms of the number and severity of cases, health experts said.

Health officials did not make an announcement to the public earlier because the mutations carried too little public health significance.

China is among seven countries, including Brazil, Japan and Mexico, that have reported isolated cases involving this mutation, according to the World Health Organization (WHO).