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In humans, maternal antibodies inhibit successful immunization against measles, because they interfere with vaccine-induced seroconversion. We have investigated this problem using the cotton rat model (Sigmodon hispidus). As in humans, passively transferred antibodies inhibit the induction of measles virus (MV)-neutralizing antibodies and protection after immunization with MV. In contrast, a recombinant vesicular stomatitis virus (VSV) expressing the MV hemagglutinin (VSV-H) induces high titers of neutralizing antibodies to MV in the presence of MV-specific antibodies. The induction of neutralizing antibodies increased with increasing virus dose, and all doses gave good protection from subsequent challenge with MV. Induction of antibodies by VSV-H was observed in the presence of passively transferred human or cotton rat antibodies, which were used as the models of maternal antibodies. Because MV hemagglutinin is not a functional part of the VSV-H envelope, MV-specific antibodies only slightly inhibit VSV-H replication in vitro. This dissociation of function and antigenicity is probably key to the induction of a neutralizing antibody in the presence of a maternal antibody.

Successful Vaccine-Induced Seroconversion by Single-Dose Immunization in the Presence of Measles Virus-Specific Maternal Antibodies