Rimondi A, et al. Evidence of a fixed internal gene constellation in influenza A viruses isolated from wild birds in Argentina (2006-2016). Emerg Microbes Infect. 2018 Nov 28;7(1):194
Wild aquatic birds are the major reservoir of influenza A virus. Cloacal swabs and feces samples (n?=?6595) were collected from 62 bird species in Argentina from 2006 to 2016 and screened for influenza A virus. Full genome sequencing of 15 influenza isolates from 6 waterfowl species revealed subtypes combinations that were previously described in South America (H1N1, H4N2, H4N6 (n?=?3), H5N3, H6N2 (n?=?4), and H10N7 (n?=?2)), and new ones not previously identified in the region (H4N8, H7N7 and H7N9). Notably, the internal gene segments of all 15 Argentine isolates belonged to the South American lineage, showing a divergent evolution of these viruses in the Southern Hemisphere. Time-scaled phylogenies indicated that South American gene segments diverged between ~?30 and ~?140 years ago from the most closely related influenza lineages, which include the avian North American (PB1, HA, NA, MP, and NS-B) and Eurasian lineage (PB2), and the equine H3N8 lineage (PA, NP, and NS-A). Phylogenetic analyses of the hemagglutinin and neuraminidase gene segments of the H4, H6, and N8 subtypes revealed recent introductions and reassortment between viruses from the Northern and Southern Hemispheres in the Americas. Remarkably and despite evidence of recent hemagglutinin and neuraminidase subtype introductions, the phylogenetic composition of internal gene constellation of these influenza A viruses has remained unchanged. Considering the extended time and the number of sampled species of the current study, and the paucity of previously available data, our results contribute to a better understanding of the ecology and evolution of influenza virus in South America.
See Also:
Latest articles in those days:
- Interim Estimates of 2023-2024 Seasonal Influenza Vaccine Effectiveness Among Adults in Korea 9 hours ago
- Abundant Intra-Subtype Reassortment Revealed in H13N8 Influenza Viruses 1 days ago
- Locations and structures of influenza A virus packaging-associated signals and other functional elements via an in silico pipeline for predicting constrained features in RNA viruses 2 days ago
- Molecular Characterization of Non-H5 and Non-H7 Avian Influenza Viruses from Non-Mallard Migratory Waterbirds of the North American Flyways, 2006~2011 2 days ago
- A case report and literature review on tocilizumab-cured acute necrotizing encephalopathy caused by influenza A virus 2 days ago
[Go Top] [Close Window]