While immunostimulatory CpG-ODN have been identified for humans and many animal species (2, 20, 30, 33, 44, 53, 62) and can therefore be used as adjuvants, the design of optimum CpG-ODN adjuvants for any particular application must consider features such as the type of backbone, length, and thymidine content.Protection against genital tract Chlamydia infection requires that immune responses be tar