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Get Free AccessIn 2012, swine influenza surveillance detected a novel reassorted influenza A virus (IAV) strain containing human-seasonal hemagglutinin (HA) and neuraminidase (NA). Subsequently, these viruses reassorted, maintaining only the human-origin H3, which resulted in a new lineage of viruses that became the most frequently detected H3 clade in US swine (2010.1 HA clade). Here, we assessed the antigenic phenotype, virulence, and transmission characteristics of this virus lineage following its introduction to swine. Relative to 2010.1 viruses from 2012 and 2014, recent 2010.1 contemporary strains from 2015 to 2017 resulted in equivalent macroscopic lung lesions and transmission in pigs. A single mutation at amino acid residue 145 within the previously defined HA antigenic motif was associated with a change of antigenic phenotype, potentially impairing vaccine efficacy. Contemporary 2010.1 viruses circulating in swine since 2012 were significantly different from both pre-2012H3N2 in swine and human-seasonal H3N2 viruses and demonstrated continued evolution within the lineage.
Joshua D. Powell, Eugenio J. Abente, Jennifer Chang, Carine K. Souza, Daniela S. Rajão, Tavis K. Anderson, Michael Zeller, Phillip C. Gauger, Nicola S. Lewis, Amy L. Vincent (2020). Characterization of contemporary 2010.1 H3N2 swine influenza A viruses circulating in United States pigs. , 553, DOI: https://doi.org/10.1016/j.virol.2020.11.006.
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Type
Article
Year
2020
Authors
10
Datasets
0
Total Files
0
Language
en
DOI
https://doi.org/10.1016/j.virol.2020.11.006
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