The invention provides Chlamydia antigens for use in the treatment, prevention and/or diagnosis of Chlamydia infection. In particular, the invention provides antigens CT733, CT153, CT601, CT279, CT443, CT372, CT456, CT381, CT255, CT341, CT716, CT745, CT387, CT812, CT869, CT166, CT175, CT163, CT214, CT721, CT127, CT043, CT823 and/or CT600 from C. trachomatis for the treatment, prevention or diagnosis of Chlamydia infection.

The invention provides Chlamydia antigens for use in the treatment, prevention and/or diagnosis of Chlamydia infection. In particular, the invention provides antigens CT733, CT153, CT601, CT279, CT443, CT372, CT456, CT381, CT255, CT341, CT716, CT745, CT387, CT812, CT869, CT166, CT175, CT163, CT214, CT721, CT127, CT043, CT823 and/or CT600 from C. trachomatis for the treatment, prevention or diagnosis of Chlamydia infection.

The present invention provides methods and compositions useful in the treatment or prevention of Chlamydia infections and cancer. The methods and compositions inhibit the entry of Chlamydia into a host cell expressing EMP2 by interfering with the interaction between the Chlamydia and EMP2. The methods and compositions target cancers which express or overexpress EMP2 nucleic acids and polypeptides by targeting EMP2.

An antibody preparation suitable for intravenous administration in humans includes IgG, IgA and at least 5% IgM antibodies by weight of the total amount of antibodies. The preparation is prepared from human plasma, has specific complement activating activity, and, in an in vitro assay with human serum suitable to determine the ability of the antibody preparation to activate complement unspecifically, the antibody preparation generates substantially no C5a and/or substantially no C3a. The antibody preparation can have medical uses.

Compositions and methods for the treatment of Chlamydial infection are disclosed. The compositions provided include polypeptides that contain at least one antigenic portion of a Chlamydia antigen and DNA sequences encoding such polypeptides. Pharmaceutical compositions, vaccines and diagnostic kits are also disclosed.