Genetic and antigenic characterization of an atypical pestivirus isolate, a putative member of a novel pestivirus species

The genus Pestivirus within the family Flaviviridae currently consists of four different main species: Classical swine fever virus, Bovine viral diarrhea virus types 1 and 2 and Border disease virus. A fifth tentative species is represented by an isolate from a giraffe. In this study, a completely new pestivirus, isolated from a batch of fetal calf serum that was collected in Brazil, is described. It is proposed that the isolate D32/00_ HoBi' may constitute a novel sixth pestivirus species, because it is genetically, as well as antigenically, markedly different from all other pestiviruses. Based on the entire Npro- and E2-encoding sequences, identities of <70 % to all other pestivirus species were determined. Similarly, cross-neutralization and binding studies using antisera and mAbs revealed marked antigenic differences between D32/00_ HoBi' and all other pestiviruses

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