Polypeptides and antibodies for treating HBV infection and related diseases

A monoclonal antibody or an antigen binding fragment thereof, wherein the monoclonal antibody specifically binds to positions 119 to 125 of HBsAg protein of HBV, and is selected from one of the following monoclonal antibodies:

• 1) the monoclonal antibody produced by the hybridoma cell line HBs-E6F6, wherein the hybridoma cell line HBs-E6F6 is deposited in China Center for Type Culture Collection (CCTCC), with a deposition number of CCTCC NO. C201270;
• 2) the monoclonal antibody produced by the hybridoma cell line HBs-E7G11, wherein the hybridoma cell line HBs-E7G11 is deposited in China Center for Type Culture Collection (CCTCC), with a deposition number of CCTCC NO. C201271;
• 3) the monoclonal antibody produced by the hybridoma cell line HBs-G12F5, wherein the hybridoma cell line HBs-G12F5 is deposited in China Center for Type Culture Collection (CCTCC), with a deposition number of CCTCC NO. C201272;
• 4) the monoclonal antibody produced by the monoclonal antibody produced by hybridoma cell line HBs-E13C5, wherein the hybridoma cell line HBs-E13C5 is deposited in China Center for Type Culture Collection (CCTCC), with a deposition number of CCTCC NO. C201273 and
• 5) the monoclonal antibody or an antigen binding fragment selected from a humanized antibody, a chimeric antibody or a single chain antibody made from any of the monoclonal antibodies as described in 1-4 above.