Henry Niman, a biochemist who tracks flu mutations, points out that human immune systems would have eliminated flu long ago if the virus had such a weak spot as the researchers are suggesting.

Henry Niman是一位追踪流感突变的生化学家，他指出如果病毒有这组科学家提出的这样一个弱点，人类免疫系统可能早就把流感消灭了。