So, you've got this situation: In 2003, we had an H5N1 virus that jumped from birds into humans in a few isolated cases with an apparent mortality rate of 70 percent.
你们已经处在这种情况当中了。 2003年， 我们遭遇一种H5N1病毒。 它能从鸟类传染到人类 在一些个例中出现这种情况。 这种病毒造成了70%的死亡率。