Reduced CCL2 was associated with severity of symptoms (p = 0.043)and increase in number of symptoms (p = 0.013). TNFSF14 levels werereduced in concussed subjects compared to repetitively-concussedsubjects. IL-7 levels were higher in repetitively- concussedsubjects compared to concussed subjects. CXCL3 was increased lessthan one week after concussion. The gene discussed is CCL2; the disease is brain injury.