CARD9 and inflammatory bowel disease: The CARD9 is an adaptor molecule found mainly in lymphoid tissues, it plays a role in the innate immune response to fungi, bacteria, virus and mycobacteria, linking innate immunity with T-cell differentiation and type 17 T helper (Th17)-cell development [9–12]; it is known that the presence of certain genetic variants of CARD9 implies an increased risk of IBD [13].