Immune system disorders<span> cause abnormally low activity or over activity of the </span>immune system<span>. In cases of </span>immune system<span> over activity, the body attacks and damages its own tissues (autoimmune </span>diseases<span>).</span>
Immune system disorders cause abnormally low activity or over activity of the immune system. In cases of immune system over activity, the body attacks and damages its own tissues (autoimmune diseases). Immune deficiency diseases decrease the body's ability to fight invaders, causing vulnerability to infections
