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Most of the presently available vaccines including hepatitis B vaccines administered through parenteral route, fail to induce a mucosal antibody response. Therefore, oral immunization appears to be an effective and attractive alternative to parenteral immunization. However, the problem of degradation of antigen in the harsh and hostile environment of the gastrointestinal tract consequently requires larger doses and more frequent dosing of antigen. Furthermore, much larger doses can induce antigen tolerance. Therefore the purpose of the present study was firstly to overcome these problems by the use of bile salt stabilized vesicles (bilosomes) and HBsAg as the model antigen,which could provide both protection to the antigen as well as enable transmucosal uptake and subsequent immunization. Another purpose of this study was to determine the dose that could produce serum antibody titres against hepatitis B via the oral route compared to those following intramuscular immunization.

Oral immunization against hepatitis B using bile salt stabilized vesicles (bilosomes)