Autoimmune diseases cause the body's immune system to attack itself.

Vaccines help the body's immune system find and attack cancer cells.

That means the immune system attacks its own body.

But now other systems are being attacked, ones with no prior involvement whatsoever.

The auto-repair systems themselves would even attack anyone trying to keep them from their work.

It causes the body's immune system to attack the lining of joints.

The system attacks any ship approaching the planet, and we can do nothing to stop it from doing so.

Experts do not know why the immune system attacks the follicles.

That means the immune system attacks the body itself.

It happens when the body's immune system attacks the blood vessel by mistake.