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Use of a heterologous prime-boost strategy based on a combination of nonreplicative immunogens and candidate attenuated virus vaccines against dengue virus in the same schedule is an attractive approach. These combinations may result in a condensed immunization regime for humans, thus reducing the number of doses with attenuated virus and the time spacing. The present work deals with the evaluation of the heterologous prime-boost strategy combining a novel chimeric protein (domain III-capsid) of dengue virus serotype 2 (DEN-2) and the infective homologous virus in the same immunization schedule in monkeys. Primed monkeys received one dose of infective DEN-2 and were then vaccinated with the recombinant protein. We found that animals developed a neutralizing antibody response after the infective dose and were notably boosted with a second dose of the chimeric protein 3 months later. The neutralizing antibodies induced were long lasting, and animals also showed the ability to induce a specific cellular response 6 months after the booster dose. As a conclusion, we can state that the domain III region, when it is properly presented as a fusion protein to the immune system, is able to recall the neutralizing antibody response elicited following homologous virus infection in monkeys. Further prime-boost approaches can be performed in a condensed regime combining the chimeric domain III-capsid protein and candidate live attenuated vaccines against DEN-2.

clinical and vaccine immunology

The Chimeric Protein Domain III-Capsid of Dengue Virus Serotype 2 (DEN-2) Successfully Boosts Neutralizing Antibodies Generated in Monkeys upon Infection with DEN-2