RPA1 and anthrax infection: Despite these dichotomous findings, numerous studies across animal models have shown that TNA titers are a reliable predictor of surviving anthrax infection.23 Our data imply that DPX-rPA-induced immunity may be more efficient in rabbits than in NHPs, which should be an important consideration when utilizing DPX technology to bridge animal efficacy and human immunogenicity data to predict efficacy in humans.