I don’t know what you need, but here are some facts
The immune system saves lives.
Before scientists understood the immune system, illness was chalked up to unbalanced humors.
Two men who unraveled the immune system's functions were bitter rivals.
Specialized blood cells are the immune system's greatest weapon.
The spleen helps your immune system work.
YOU HAVE IMMUNE CELLS IN ALL OF YOUR TISSUES.
HOW FRIENDLY YOU'RE FEELING COULD BE LINKED TO YOUR IMMUNE SYSTEM.
YOUR IMMUNE SYSTEM MIGHT RECRUIT UNLIKELY ORGANS, LIKE THE APPENDIX, INTO SERVICE.
GUT BACTERIA HAS BEEN SHOWN TO BOOST IMMUNE SYSTEMS IN MICE.
I hope this is helpful and if you need more, tell me