Tests on chickens and mice show that avian flu H5N1 virus isolated from ducks in 2004 is more virulent and harmful to mammals than in recent years.
Tests on chickens and mice show that avian flu H5N1 virus isolated from ducks in 2004 is more virulent and harmful to mammals than in recent years.
在雏鸡和小鼠进行的实验显示，2004年从鸭身上分离出的H5N1病毒同今年其他病毒相比，毒力更强，对哺乳动物危害更大。