From numerous studies conducted on rabid dogs, cats, and ferrets, we know that rabies virus inoculated into a muscle travels from the site of the inoculation to the brain by moving within nerves.

通过对狗，猫，雪貂进行了详实的研究，我们知道，狂犬病毒入侵机体，从入侵地方通过神经系统向大脑移动，动物在这段时间，没有发病症状，也被叫做潜伏期，时间从几周到几个月不等。

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The vaccine was created by taking a glycoprotein antigen from the rabies virus and inserting it into Vaccinia virus, the same one used for smallpox inoculation.

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