When I was in high school, most of my friend had bicycles. I hoped I could also have it. One day I saw a second-hand bicycle, that was only one hundred yuan. I asked my father the money. But he said he could only give me half of the money. He should find the other half myself. So I went to sell newspapers after the school. My father was pleasing when I showed him the money a month after. He gives me the other fifty. You can imagine how much happy I was when I rode to school on my own bicycle.

关于禽流感病毒，正确的有（）。

A、候鸟可以传播

B、美洲多见

C、不感染人类

D、可导致垂直传播

E、人禽共患病病原体