CRP and post-traumatic stress disorder: Multiple studies reported elevated serum CRP levels in individuals with PTSD (Michopoulos et al., 2015; Lindqvist et al., 2017; O'Donovan et al., 2017; Miller et al., 2001; Heath et al., 2013; Bersani et al., 2016), which led investigators to study gene polymorphisms in CRP as a candidate gene for PTSD.