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- W2070892172 abstract "More than a decade ago, successful replication of hepatitis A virus (HAV) in cell culture opened the way to the development of live attenuated and inactivated vaccine candidates. Serial passages of HAV in cell culture led to attenuation as demonstrated by experiments in non-human primates. Several live vaccine candidates obtained through serial passages have been evaluated in volunteers. Significant improvements in the yield of viral antigen from infected cell cultures stimulated the development of killed vaccine candidates. These formalin-inactivated vaccines contain the viral capsid antigens assembled into viral particles. The immunogenic potential of the vaccine candidates depends strongly on the preservation of the configuration of the capsid proteins. Synthetic peptides covering immunogenic sequences of VP1 as well as soluble capsid proteins expressed as fusion proteins in Escherichia coli were therefore only weakly immunogenic when injected at high concentrations in rabbits. On the other hand, tamarin monkeys immunized with a live recombinant vaccinia expressing P1 were protected against virulent challenge. There are, however, considerable drawbacks related to the use of live vaccinia as a carrier virus. Chimeric polio-HAV VP1 viruses have been constructed. These hybrid viruses were not able to induce an immune response, probably because of configurational constraints of poliovirus on the inserted HAV epitopes. More recently, encouraging data on empty virus particles expressed in baculovirus and vaccinia virus systems have been reported." @default.
- W2070892172 created "2016-06-24" @default.
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- W2070892172 date "1992-01-01" @default.
- W2070892172 modified "2023-09-26" @default.
- W2070892172 title "Possible approaches to develop vaccines against hepatitis A" @default.
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- W2070892172 doi "https://doi.org/10.1016/0264-410x(92)90542-r" @default.
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