Electrical engineers look to the human immune system for clues on how to protect digital networks

Bit of a stretch maybe? The biological immune system goes through a process during fetal development where the immune system "learns" how to identify "self". This "self" model is set once in the beginning basically doesn't change. Modern digital systems are constantly getting upgraded with new components so this digital version of an immune system would need to keep up somehow.
In biology there is inflammation and autoimmune disease where the system temporarily harms itself or actually ends up destroying essential systems that are actually functioning normally.
Of course, the end goal of this would be to stop intruders just long enough so humans could intervene before data was compromised. One thing biology doesn't have is reboot/restore.