The present invention provides novel chlamydia antigens, nucleic acids encoding the antigens, and immunogenic compositions including the antigens. The present invention further provides methods of using the antigens to elicit immune responses (e.g., T cell-mediated and/or B cell-mediated immune responses). The present invention provides methods of prophylaxis and/or treatment of chlamydia-mediated diseases comprising administering an immunogenic composition including one or more of the novel antigens described herein.
