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Viral vaccines and the cell substrates used to manufacture them are subjected to tests for adventitious agents, including viruses, contaminate. Some of the compendial methods (in vivo and in vitro in cell culture) were established in the mid-20th century. These methods have not been subjected to current assay validation, as new methods would need to be. This study was undertaken to provide insight...
The cold-adapted (ca), temperature-sensitive (ts) respiratory syncytial virus (RSV) subgroup B vaccine candidate, designated RSV 2B33F, was found previously to be restricted in replication, immunogenic, and protective against wild-type (wt) virus challenge in rodents and African green monkeys. We sought to investigate the level of attenuation, immunogenicity and genetic stability of this vaccine candidate...
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