This book[1] is the best resource for a "medium-level" overview I've come across. Once you get beyond that, you're entering textbook and then paper territory.

This book[1] is the best resource for a "medium-level" overview I've come across. Once you get beyond that, you're entering textbook and then paper territory. [1]: http://www.amazon.com/Immune-System-Includes-Desktop-Edition/dp/0470657294/ref=sr_1_1?ie=UTF8&qid=1402074187&sr=8-1&keywords=how+the+immune+system+works http://www.amazon.com/Immune-System-Includes-Desktop-Edition...