Human-to-human transmission of avian flu is rare , but the virus has passed from poultry to humans in some cases . China kills many birds in northwest to control what it calls an epidemic of bird flu . 500 birds that died in Xinjiang Uygur Autonomous Region tested positive for H5N1 . In late 2010 , China confirmed its sixth case of bird flu in a human . The virus has killed more than 100 birds since 2003 .
China kills many birds in northwest to control what it calls an epidemic of bird flu . 500 birds that died in Xinjiang Uygur Autonomous Region tested positive for H5N1 . In late 2010 , China confirmed its sixth case of bird flu in a human . The virus has killed more than 100 birds since 2003 .