✔ 最佳答案
The original bird flu only occurs on the birds and beasts bird body, but likely the birds and beasts bird contracted cold
present H5N1 this kind of virus already to be able 夠 the high birds and beasts bird body to upload equally the humanity, and between the humanity infected the humanity
was mutually the mammalia animal, originally should not be able to infect to birds' viral
H5N1 can 夠 pass to the humanity from the birds and beasts bird, has broken through very many from the checkpoint, indicated H5N1 has become very much strong
when H5N1 passed to the humanity, because to the human body is one kind of new virus, therefore the mortality rate was very high
if the H5N1 development teach other people to might the very easy person time, the world will be able to have very many people therefore to die