Hello @alanasteemit
This topic is something I particularly like, I think we talked about it some time ago. Here in Colombia there is a very good school of this science.
It is something complex, and yes, the first thing is that you have to understand how the immune system works to help it to do its function.
These topics are usually complex, especially if you are not familiar with medical terms. But, with effort you can still understand it.
Good to see you in PH. Welcome.