You may already know, but as you are growing up, you get two single MMR vaccine shots. You get the first one just a few months after being born, and then another one a few years after birth. So why do they do that? Isn’t the first shot enough to protect you? Well, in most cases it is. The first single MMR vaccine usually protects people, and they are fine. However, the second shot is to make sure that people have adequate protection from the first vaccination. These are very deadly diseases that these vaccines protect against. It is a must to make sure that you are protected from them and that you stay protected from them.