Not necessarily. You can even sleep in the same bed with someone who has lice and you might not ever get it from them. The reason is that lice are attracted to certain body chemistries more than others. So some people will get lice every time they are exposed to it, while other people will never get lice. It’s somewhat similar to the way that some people get eaten up by mosquitos while the person standing next to them doesn’t get bitten at all. Since we don’t know which body chemistries are more lice-prone than others, it’s always best to take precautions so you don’t put yourself at risk. Click here to learn more about how to prevent getting lice.