GM-SCF boosts innate immunity to make it immediately effective against the virus, and its protective effect has not been shown to be strain dependant so far.

GM - SCF能强化先天免疫性直接有抗病毒作用，并且它的保护作用迄今没有表明有菌株依赖。

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Also, the vaccines against polio are not as effective as the smallpox vaccine, which was so powerful that a single vaccination protected almost everyone.

同时，抵抗小儿麻痹症病毒的疫苗的功效没有像天花疫苗那么有效，天花疫苗非常有效，以至于它只需要打一针就可以保护一个人不受侵害。

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