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DNA vaccination may represent an interesting strategy for early life immunization. However, in some cases, this approach has been shown to induce a tolerance rather than immunity. We have compared the efficiency of neonatal DNA or protein immunization against hepadnavirus envelope protein using the duck hepatitis B virus (DHBV) model. Three-day-old ducklings were immunized with either a plasmid encoding the DHBV pre-S/S large envelope protein (L), or a recombinant preS protein, followed by sequential DNA or protein boosts at weeks 4 and 15. Our results showed that genetic immunization of duck neonates induced specific humoral response to DHBV L protein. Interestingly, an enhanced antibody response was elicited when animals received DNA priming-DNA boosting as compared to DNA priming-protein boosting.


Journal article



Publication Date





3091 - 3096


Animals, Animals, Newborn, Ducks, Hepatitis Antibodies, Hepatitis B Virus, Duck, Immunization, Immunization Schedule, Vaccines, DNA, Viral Envelope Proteins, Viral Vaccines