 3. Visit 6 week 12: Participants will undergo usual assessment, treatment response will also be determined at this visit CGI-I score 2 as well as a 30 drop in YBOCS score. Participants will be provided with a collection kit and instructed on appropriate fecal sample collection as outlined above. The sample collected will be the first bowel movement of the day. Blood samples will be drawn at a local Gamma-Dynacare lab to examine serum levels of IL-6, TNF α and CRP. Patient diet will also be assessed using the ACCVFFQ. 