Special Issue "Advances in Animal Influenza Virus Research: Volume II"

A special issue of Viruses (ISSN 1999-4915). This special issue belongs to the section "Animal Viruses".

Deadline for manuscript submissions: 20 November 2023 | Viewed by 1390

Special Issue Editors

Virology Department, Istituto Zooprofilattico Sperimentale della Lombardia ed Emilia-Romagna, Via Bianchi 9, 25124 Brescia, Italy
Interests: avian and swine influenza A viruses; influenza D viruses; coronaviruses; suid herpesvirus
Special Issues, Collections and Topics in MDPI journals
WOAH Reference Laboratory for Swine Influenza, Istituto Zooprofilattico Sperimentale della Lombardia ed Emilia-Romagna, 25124 Brescia, Italy
Interests: swine influenza; virus NGS sequencing; influenza D virus; influenza A virus
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, there has been a significant increase in the number of influenza A virus infections globally in both humans and animals. Recently, the worldwide spread of HPAIV H5 has been of particular concern, involving a large number of domestic and wild avian species and with recent reports of infections in mammals and wild animals. In 2009, there was a new influenza pandemic from a virus of swine origin, and since 2013, there have been several cases of HP and LPAIV H7N9 viruses in poultry, with subsequent transmission to humans in China. Swine influenza viruses are also of great concern due to the frequent occurrence of reassortment events and the high antigenic and genetic variability of the circulating strains, with negative implications for both the pig industry and public health. The ecology of influenza A viruses is very complex and involves a wide range of avian and mammalian host species. Influenza viruses have high mutation rates and are constantly evolving, allowing the virus to adapt rapidly to changes in the host environment, thus crossing the species barrier and leading to the emergence of new viruses with a pandemic potential.

Other influenza B, C and D viruses are also to be considered, and their importance should not be underestimated. Influenza D viruses, discovered only in 2011, were found to be present in cattle, but their ability to infect other species, including humans, is not yet well understood.

The aim of this second volume of the Special Issue is to provide a complete overview of all aspects relating to animal influenza viruses, such as the ecology of infection, epidemiology and populations at risk, pathogenesis, diagnosis, genetic and antigenic characterization of circulating viruses, phylogenetic analyses, and reassortment and spillover events. Human cases of animal influenza viruses are encouraged, and research papers, review articles and short communications are invited.

Dr. Ana Moreno
Dr. Chiara Chiapponi
Guest Editors

Manuscript Submission Information

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Keywords

  • animal influenza viruses
  • human infections
  • animal infections
  • epidemiology
  • pathogenesis
  • genetic characterization
  • antigenic characterization
  • reassortment events
  • spillover

Published Papers (2 papers)

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Research

Article
Different Outcomes of Chicken Infection with UK-Origin H5N1-2020 and H5N8-2020 High-Pathogenicity Avian Influenza Viruses (Clade 2.3.4.4b)
Viruses 2023, 15(9), 1909; https://doi.org/10.3390/v15091909 - 12 Sep 2023
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Abstract
Clade 2.3.4.4 H5Nx highly pathogenic avian influenza viruses (HPAIVs) of the “goose/Guangdong” lineage have caused a series of European epizootics since 2014. During autumn/winter 2020–2021, several H5Nx subtypes were detected in the UK, with H5N8 being the dominant subtype in wild birds and [...] Read more.
Clade 2.3.4.4 H5Nx highly pathogenic avian influenza viruses (HPAIVs) of the “goose/Guangdong” lineage have caused a series of European epizootics since 2014. During autumn/winter 2020–2021, several H5Nx subtypes were detected in the UK, with H5N8 being the dominant subtype in wild birds and poultry. Despite the greater subtype diversity (due to viral neuraminidase gene reassortment) reported in wild birds, only H5N8 and H5N1 subtypes caused clade 2.3.4.4 UK HPAIV poultry outbreaks during this period. The direct inoculation of layer chickens showed that H5N8-2020 was more infectious than H5N1-2020, which supported the European H5N8 dominance during that season. However, the mean death time was longer for H5N8-2020 (3.42 days) than for H5N1-2020 (2.17 days). Transmission from directly infected to naive in-contact chickens was inefficient for both subtypes. Histological lesions, the tissue dissemination of viral antigen, and nucleic acid were more extensive and abundant and accumulated more rapidly for H5N1-2020 compared with H5N8-2020. Although inefficient, H5N1-2020 transmission was faster, with its greater virulence indicating that this subtype posed a major concern, as subsequently shown during H5N1 dominance of the clade 2.3.4.4 epizootic since autumn 2021. An evaluation of these in vivo viral characteristics is key to understanding the continuing poultry threats posed by clade 2.3.4.4 H5Nx HPAIVs. Full article
(This article belongs to the Special Issue Advances in Animal Influenza Virus Research: Volume II)
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Article
Spreading of the High-Pathogenicity Avian Influenza (H5N1) Virus of Clade 2.3.4.4b into Uruguay
Viruses 2023, 15(9), 1906; https://doi.org/10.3390/v15091906 - 11 Sep 2023
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Abstract
Background: Avian influenza viruses (genus Alphainfluenzavirus, family Orthomyxoviridae) infect avian and mammal hosts. In 2022, the high pathogenicity avian influenza virus (H5N1) spread to South America, resulting in the loss of thousands of wild birds, including endangered species, and severely impacting [...] Read more.
Background: Avian influenza viruses (genus Alphainfluenzavirus, family Orthomyxoviridae) infect avian and mammal hosts. In 2022, the high pathogenicity avian influenza virus (H5N1) spread to South America, resulting in the loss of thousands of wild birds, including endangered species, and severely impacting the global poultry industry. Objectives: We analyzed the complete genomes of influenza viruses obtained from wild birds and backyard poultry in Uruguay between February and May 2023. Methods: Twelve complete genomes were obtained in 2023 from cloacal swabs using Illumina sequencing. Genomes were phylogenetically analyzed with regional and global strains. Findings: The identified strains have multiple basic amino acids at the hemagglutinin cleavage sites, which is typical for highly pathogenic strains. The Uruguayan viruses belonged to hemagglutinin clade 2.3.4.4b of the H5N1 subtype. A reassortment in North America has resulted in some segments of South American strains being of Eurasian or North American origins. The Uruguayan viruses shared a common ancestor with South American strains from Argentina and Chile. The influenza viruses displayed a spatiotemporal divergence pattern rather than being host-specific. Main Conclusions: The arrival of the 2.3.4.4b clade in Uruguay may have been mediated by birds that acquired the virus from Argentine and Chilean waterfowl migrating in the Pacific Flyway. Full article
(This article belongs to the Special Issue Advances in Animal Influenza Virus Research: Volume II)
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