About 300 cases of H7N9 avian influenza have been confirmed in China, with more appearing every day.
Cases of the new H7N9 avian influenza in China are surging alarmingly, flu experts warned this week.
There are now about 300 confirmed cases, with more appearing every day. Roughly a quarter of the victims have died.
The first human cases were reported only last March. By contrast, the H5N1 influenza virus, another lethal strain that jumped from birds to people, first appeared in 2003 and took almost five years to reach the 300-case mark.