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  • Title: Comparison of the immunological and protective responses elicited by microencapsulated formulations of the F1 antigen from Yersinia pestis.
    Author: Reddin KM, Easterbrook TJ, Eley SM, Russell P, Mobsby VA, Jones DH, Farrar GH, Williamson ED, Robinson A.
    Journal: Vaccine; 1998 May; 16(8):761-7. PubMed ID: 9627932.
    Abstract:
    Purified native F1 antigen from Yersinia pestis was used to assess controlled-release vaccine delivery systems in poly(lactide-co-glycolide) (PLG) microparticles and liposomes. Antigen encapsulated in PLG microparticles induced high serum titres when injected i.p. in mice: mucosal IgA was also detected. Mice immunized with F1 in Alhydrogel or PLGs were protected against subcutaneous challenge with Y. pestis. F1 antigen surface-labelled onto liposome vesicles stimulated high serum titres in Balb/c mice and also induced a mucosal response: F1-labelled liposomes protected mice against challenge with up to 1 x 10(5) organisms. These findings indicate that a significant immune response is induced by immunizing with F1 formulated in PLGs and liposomes and that protection was achieved after only one dose.
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