Two more human cases of H5N6 bird flu detected in China
It is as of yet unclear how one of the cases was exposed to the virus.
A sign at the edge of an exclusion zone warns of the closure of a footpath after an outbreak of bird flu in the village of Upham in southern England, February 3, 2015.(photo credit: REUTERS/PETER NICHOLLS)ByTZVI JOFFREUpdated:
