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Porcine teschoviruses (PTVs) constitute 1 of the 31 genera within the Picornaviridae family, comprising at least 13 genetic types (PTV-1 to PTV-13), of which only 11 (PTV-1 to PTV-11) have been recognized as serotypes to date. Specific for swine and wild boars, most PTVs are usually non-pathogenic, but some viral variants cause severe disorders in the central nervous system (Teschen disease) or milder signs (Talfan disease), as well as reproductive, digestive and respiratory disorders and skin lesions. Previous studies revealed a high diversity of teschoviruses circulating in Spanish pig populations. Phylogenetic analysis performed with these sequences and others available in GenBank disclosed 13 clusters, 11 of which corresponded to the known PTV serotypes, and 1 of 2 additional groups is represented by isolate CC25, whose full-length genomic sequence has been obtained. This group is new to science, and was putatively named PTV-12. Here, a complete characterization of this isolate is presented, including the experimental infection of minipigs to assess tissue tropism and possible pathogenicity in vivo in the host species. In addition, using this experimental animal model, we investigated whether a pre-existing infection with this PTV-12 isolate could confer cross-protection against infection with a heterotypic PTV-1 virulent strain. Based on phylogenetic analysis and serological data, we propose CC25 as the prototype strain of a new teschovirus serotype, PTV-12.

Characterization of PTV-12, a newly described porcine teschovirus serotype: in vivo infection and cross-protection studies