First half of that sentence is right, the second half is wrong.
Reading the article, I see this paragrah:
"Variants on this hyperactive immune reaction occur in an array of conditions, triggered by infection, faulty genes or autoimmune disorders in which the body thinks its own tissues are invaders (see box). All fall under the umbrella term “cytokine storm,” named because substances called cytokines rampage through the bloodstream. "
So, where am I mistaken?