There are diverse types of vaccines approved for use today. For example, there are: live, heat-killed, mRNA, recombinant, and viral-vector derived vaccines. Pick one and discuss how it works. What does the immune system do after a vaccine or a naturally acquired antigen enters your body? Think about the cells and molecules involved in the process of gaining immunity. Alila Medical Media. (2018, December 11). The immune system overview, animation [Video]. YouTube. https://www.youtube.com/watch?v=lxC-3MpIMUo