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  • Title: Immunization of rabbits with enterotoxigenic E. coli colonization factor antigen (CFA/I) encapsulated in biodegradable microspheres of poly (lactide-co-glycolide).
    Author: Edelman R, Russell RG, Losonsky G, Tall BD, Tacket CO, Levine MM, Lewis DH.
    Journal: Vaccine; 1993; 11(2):155-8. PubMed ID: 8094929.
    Abstract:
    We have searched for an effective oral delivery system for a purified enterotoxigenic Escherichia coli (ETEC) fimbrial adhesin, CFA/I, which elicits anti-colonization immunity. Purified CFA/I antigen encapsulated in biodegradable polymer microspheres of poly (DL-lactide-co-glycolide) (PLG) induced a vigorous, systemic CFA/I IgG antibody response in rabbits immunized once via intragastric tube; oral, unencapsulated CFA/I induced little or no circulating antibody. CFA/I-specific, S-IgA coproantibody was detected in one of three rabbits fed with the CFA/I-PLG microsphere vaccine. We conclude that PLG microspheres protected CFA/I from degradation in the stomach and effectively delivered the antigen for processing by the host's immune system.
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