Imagine that a simple test could tell whether you were going to come down with the flu or a cold even before you get hit by a sore throat, runny nose or fever.

• 设想一下，以后可能有一个简单的测试，能让你在嗓子疼、流鼻涕和发烧之前就知道自己感染的到底是流行性感冒还是普通感冒。