Evaluation of water-in-oil-in-water multiple emulsion and microemulsion as potential adjuvants for immunization with rabies antigen

Water-in-oil-in-water (W/O/W) multiple emulsions and microemulsions have been studied as potential candidates to be formulated as adjuvants. In this work their application as adjuvants for rabies virus immunization was studied. The humoral response, the effective dose 50 and histology for the developed formulations were evaluated in mice and compared with those from traditional adjuvants. The microemulsion and W/O/W multiple emulsion adjuvants developed were able to induce humoral response in mice and the serum showed good in vivo protection. Compared to the other adjuvants evaluated, microemulsion was shown to be the best candidate for rabies immunization as it presented good potency against the virus and did not appear to cause any local reaction.