The present disclosure relates to antibodies, and
antigen binding fragments thereof, that can bind to the antigenic loop region of
hepatitis B surface
antigen (
HBsAg) and can neutralize infection of both
hepatitis B
virus (HBV) and
hepatitis delta virus (HDV). The present disclosure also relates to epitopes to which the antibodies and
antigen binding fragments bind, as well as to fusion proteins that comprise the
antigen binding fragments, and to nucleic acids that
encode and cells that produce such antibodies and
antibody fragments. In addition, the present disclosure relates to the use of the antibodies and
antibody fragments of the present disclosure in the diagnosis, prophylaxis and treatment of
hepatitis B and
hepatitis D.