I have heard it said and believe the body never attacks itself (autoimmune). The theory being that the immune system is trying to get at and destroy viruses hidden either behind biofilms or defensive cloaking strategies of the virus itself.
The lymphatic system plays a HUGE role in health and is often overlooked. Edema being a sure sign of a clogged septic system caused by salt imbalance normally the result of dehydration. If one lives a sedentary life buy a 40 dollar rebounder and pump out your septic tank.
It is good to see a study connecting these dots and a new focus on the whole.