Disclosed is a humanized antibody or fragment thereof capable of binding to interleukin-10 (IL-10), wherein said antibody or fragment thereof comprises a variable light chain comprising the amino acid sequences SEQ ID NO: 71, 72 and 73 (SSQNIVHSNGNTY, KVSNRFSGVPDR and GSHVPW respectively), and a variable heavy chain comprising the amino acid sequences SEQ ID NO: 74, 75 and 76 (ASGFSFATYG, IWRGGSTDYSAAFMSR and QAYGHYMD respectively).