1. First report of porcine respirovirus 1 in South America.
- Author
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Agüero, B., Mena, J., Berrios, F., Tapia, R., Salinas, C., Dutta, J., van Bakel, H., Mor, S.K., Brito, B., Medina, R.A., and Neira, V.
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SWINE influenza , *SWINE farms , *SALIVA , *VIRUS diversity , *RESPIRATORY diseases , *RNA sequencing , *POLYMERASE chain reaction - Abstract
• We described the first report of RPV1 in Latin America. The virus was genetically related with RPV1 viruses in USA and China. • We tested 164 samples (2015-2019), from 6 commercial farms, representing >80% of Chilean swine production. • Five farms were positive and we obtained two near to complete genomes from two of them. • Phylogeny suggest Chilean PRV1 are genetically related to RPV1 strains from USA and China, but the actual origin could not be determined. Porcine respirovirus 1 (PRV1) is an emerging virus in pigs that has been previously described in the USA and China. There are no reports of its presence in the rest of the world. The objective of this study was to determine the occurrence of PRV1 in Chile and to determine its phylogeny. Thus, we collected samples (oral fluids, nasal swabs, and lungs) from a swine influenza A virus (IAV) surveillance program, most of which belonged to pigs with respiratory disease. The samples were analyzed by RT-PCR, and the viral sequencing was obtained using RNA whole-genome sequencing approach. Maximum likelihood phylogeny was constructed with the available references. Thirty-one of 164 samples (18.9 %) were RT-PCR positive for PRV1: 62.5 % oral fluids, 19.0 % nasal swabs, and 8.6 % lungs. All 6 farms in this study had at least one positive sample, with 6–40 % of positive results per farm, which suggests that PRV1 is disseminated in Chilean swine farms. Twenty-one of 31 (677%) PRV1-positive samples were also positive for IAV, so the role of PRV1 as secondary pathogen in respiratory disease needs to be further evaluated. Near to complete genome of two PRV1s were obtained from two farms. The phylogenies, in general, showed low bootstrap support, except the concatenated genome and the L gene trees which showed clustering of the Chilean PRV1 with Asian sequences, suggesting a close genetic relationship. This is the first report of PRV1 in the Southern Hemisphere. Further studies are necessary to determine the genetic diversity of this virus in Chile. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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