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Neonatal animals were not considered as suitable vaccine recipients either because of immune immaturity or because passively delivered antibody interferes with immune induction. In this report, we evaluated the response of neonatal mice to immunization with naked DNA encoding a herpes simplex virus (HSV) protein, and determined if maternally derived HSV antibody interfered with immunogenicity. Our results show that neonatal mice develop effective humoral and T cell responses after immunization with either DNA or inactivated vaccines. The nature of the responses to HSV immunization, however, was more Th2-like in neonates than in adults. Whereas neonatal mice from HSV-naive mothers responded well to both DNA and inactivated vaccines, only DNA immunization induced effective immunity in neonates born to immune mothers. Our results indicate that DNA vaccines might provide a useful means of immunizing young animals that still possess high levels of potentially interfering maternal antibody.

DNA immunization of neonates induces immunity despite the presence of maternal antibody.