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Complete genome characterization of porcine circovirus 3 recovered from wild boars in Southern Brazil.

In the present study, the complete nucleotide sequence of porcine circovirus 3 (PCV3) recovered from wild boars lymph nodes is described. The full genome was named PCV3-wb/Br/RS and comprises 2,000 nucleotides with two open reading frames (ORFs) with a stem-loop motif in intergenic region. The ORFs are oriented in opposite directions and encode the putative capsid (Cap) and replicase (Rep) proteins. Based on amino acid motifs analysis, PCV3-wb/Br/RS as well as most of the sequences from wild boars are classified as PCV3b. Phylogenetic analysis including 97 PCV3 sequences available in databases showed that the PCV3-wb/Br/RS genome is more closely related to genomes recovered in Spain, China, Germany and Denmark. Phylogenetic inferences among PCV3-wb/Br/RS and other circoviruses confirmed that these seem to have a most recent common ancestor with bat-associated circoviruses. In addition, PCV3 infection was investigated by real-time PCR in a cohort of 80 wild boars in Southern Brazil. A total of 29 animals (36.3%) were PCV3-positive leading the conclusion that PCV3 is circulating in the wild boar population in Southern Brazil. The role played by PCV3-like infections in wild boars and the risk these could pose to commercial swine production within that region remains to be further investigated.