CRP and post-traumatic stress disorder: Several papers have shown that individuals with comorbidity of PTSD and MS also had lower inflammatory biomarkers such as IL-6 and C-reactive protein (CRP) (von Känel at al., 2010[97]), conferring additional health risks to people beyond those related to MS alone (Bastard et al., 2006[7]; Marsland et al., 2010[52]).