![[This image shows a person’s hand, and a syringe is being held between the person’s fingers. The needle of the syringe is pointed towards a round pathogen cell with small projections.]](https://blogs.iu.edu/sciu/files/2021/03/virus-5768628_1920.jpg)
There are many strategies when it comes to developing a vaccine, but the idea behind all of them is similar. Vaccines are designed to pose a foreign invader, such as a virus or bacterium, to your adaptive immune system without causing you to be sick. Our immune systems are quite amazing, which also makes them quite complex. Here, we will focus only on a few aspects that are important for understanding vaccine development…