Abstract
Domestic swine have been introduced by humans into a wide diversity of environments and have been bred in different production systems. This has resulted in an increased risk for the occurrence and spread of diseases. Although viromes of swine in intensive farms have been described, little is known about the virus communities in backyard production systems around the world. The aim of this study was to describe the viral diversity of 23 healthy domestic swine maintained in rural backyards in Morelos, Mexico, through collection and analysis of nasal and rectal samples. Next-generation sequencing was used to identify viruses that are present in swine. Through homology search and bioinformatic analysis of reads and their assemblies, we found that rural backyard swine have a high degree of viral diversity, different from those reported in intensive production systems or under experimental conditions. There was a higher frequency of bacteriophages and lower diversity of animal viruses than reported previously. In addition, sapoviruses, bocaparvoviruses, and mamastroviruses that had not been reported previously in our country were identified. These findings were correlated with the health status of animals, their social interactions, and the breeding/rearing environment (which differed from intensive systems), providing baseline information about viral communities in backyard swine.
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Availability of data and material
Sequences are available in GenBank with accession numbers MH490914, MH490915, MH490916, MH490912, MH490913, MH490911 and MH479904.
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Acknowledgements
We thank Omar Ríos Bello, Omar Maldonado Pineda, José López Reyeros, Julio José Barrón Rodríguez, and Francisco A. Rosas Rodríguez for their help in field work. We also thank Carlos Cabello and José Eduardo Márquez García for their support during the sequencing work at the INER, and Jairo Betancourt for his help in translation of this text.
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This work was supported by the National Institute of Research in Forestry, Agriculture and Livestock (INIFAP) and the Mexican Council for Science and Technology (CONACyT) [scholarship 219623].
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Conceived by Rodrigo J. Barrón-Rodríguez and Elizabeht Loza-Rubio. Performed research: Rodrigo J. Barrón-Rodríguez, Edith Rojas-Anaya, José A.I. Romero-Espinosa, Joel A. Vázquez-Pérez and Moisés Cortés-Cruz. Analyzed the data: Rodrigo J. Barrón-Rodríguez, Jorge T. Ayala-Sumuano, Gary García-Espinosa. Wrote the paper: Rodrigo J. Barrón-Rodríguez, Elizabeth Loza-Rubio, Moisés Cortés-Cruz and Gary García-Espinosa.
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The care, handling and sampling of animals for this study were conducted in accordance with the guidelines issued by the Secretary of Agriculture and Rural Development (Spanish acronym, SADER). The experiment was approved by the Institutional Committee for Care and Use of Experimental Animals (Spanish acronym, CICUAE) of the Faculty of Veterinary Medicine and Animal Science at the Universidad Nacional Autónoma de México (UNAM) by protocol DC-2016/2-2.
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Barrón-Rodríguez, R.J., Rojas-Anaya, E., Ayala-Sumuano, J.T. et al. Swine virome on rural backyard farms in Mexico: communities with different abundances of animal viruses and phages. Arch Virol 166, 475–489 (2021). https://doi.org/10.1007/s00705-020-04894-y
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DOI: https://doi.org/10.1007/s00705-020-04894-y