H7N9 cases up in China; WHO warns of serious threat

China has seen a double-digit increase in the number of confirmed H7N9 bird flu cases over the past week, while a World Health Organization (WHO) official described Wednesday the new avian flu strain as a serious threat to human health.

(Full text of the story is now in CNA English news archive. To view the full story, you will need to be a subscribed member of the CNA archive. To subscribe, please read here.)