Disclosed is an isolated monoclonal antibody, or antigen binding portion thereof, which binds an epitope on human Toll-like Receptor 2 with a KD of 3x10-8 M or less and which mediates TLR2 antagonism independent of binding of the antibody or the antigen binding portion thereof to CD32 (Fc gamma receptor II), wherein the epitope (SEQ ID NO: 13 KEESSNQASLSCDRNGICKGS and SEQ ID NO: 14 CSCEFLSFTQEQQ) is recognised by a reference antibody and wherein that reference antibody is comprised of SEQ ID NO:4 or 5 and SEQ ID NO: 1 or 2.