即使在感染你的时候，感冒病毒也会发生变异，而且新的病毒毒株经常出现，以至于当制药商研制出针对其中一种变异的疫苗时，血清已经过时了。
Colds mutate even while they're infecting you, and new strains pop up so often that by the time drug-makers create a vaccine against one variation, the serum is already out of date.
至于为什么疫苗会导致格林·巴利综合症，目前无人能完全说清楚，但不可否认的是，超过500人都患上了这一疾病，有25人甚至丢了性命(与此同时，猪流感却并未像人们所担心的那样大肆流行)。
No one is entirely sure why the vaccine caused guillain-barre syndrome, but it affected more than 500 people and killed about 25. (the feared swine flu epidemic never materialized that year.)
我们可能需要接受的事实是，公众对疫苗安全性的认识可以因无根据的恐惧而产 生永久性的变化，以至于无论有多少证据都不能改变公众的想法。
We may need to accept the fact that public perceptions about vaccine safety can be permanently changed by unfounded fears, to an extent that no amount of evidence can change the public’s mind.
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