为什么男主不会被感染？
丑嘴唇:
Neville appears to have a "natural" immunity. Natural immunities are genetically-based and cannot be passed to other people, with the exception of newborn infants whose mothers have conferred upon them short-term immunities through the placenta or breast-milk. In the case of the alpha female, she appears to have been developing an "acquired" immunity. Acquired immunities are developed after an individual has been infected with a virus or other pathogen. The compound that Neville injected into her appears to have stimulated her body's immune system to produce antibodies against the virus. It's these antibodies found in the blood that can be used to confer immunity on others. Neville's blood doesn't contain those antibodies because he never got the disease in the first place nor does he have the compound in his blood because he never injected himself with it你这个问题刚好IMDB上面有个官方解答。原文照搬过来。大致就是男主天生有免疫力，但是这种免疫力是基因决定的，所以就算把血打给别人别人也没有办法得到他的免疫力。而那个女试验品的免疫力是后天产生的，有点像牛痘一样，感染了以后才会产生。男主给她打的东西刺激她的免疫系统产生了对病毒的抗体，这些抗体就可以帮助别人免于感染了。但是男主的血是没这个东西的。
3回答
我是传奇
