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Gadzhiev A, Petherbridge G, Sharshov K, Sobolev I, Alekseev A, Gulyaeva M, Litvinov K, Boltunov I, Teymurov A, Zhigalin A, Daudova M, Shestopalov A. Pinnipeds and avian influenza: a global timeline and review of research on the impact of highly pathogenic avian influenza on pinniped populations with particular reference to the endangered Caspian seal ( Pusa caspica). Front Cell Infect Microbiol 2024; 14:1325977. [PMID: 39071164 PMCID: PMC11273096 DOI: 10.3389/fcimb.2024.1325977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Accepted: 05/21/2024] [Indexed: 07/30/2024] Open
Abstract
This study reviews chronologically the international scientific and health management literature and resources relating to impacts of highly pathogenic avian influenza (HPAI) viruses on pinnipeds in order to reinforce strategies for the conservation of the endangered Caspian seal (Pusa caspica), currently under threat from the HPAI H5N1 subtype transmitted from infected avifauna which share its haul-out habitats. Many cases of mass pinniped deaths globally have occurred from HPAI spill-overs, and are attributed to infected sympatric aquatic avifauna. As the seasonal migrations of Caspian seals provide occasions for contact with viruses from infected migratory aquatic birds in many locations around the Caspian Sea, this poses a great challenge to seal conservation. These are thus critical locations for the surveillance of highly pathogenic influenza A viruses, whose future reassortments may present a pandemic threat to humans.
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Affiliation(s)
- Alimurad Gadzhiev
- Institute of Ecology and Sustainable Development, Dagestan State University, Makhachkala, Russia
| | - Guy Petherbridge
- Institute of Ecology and Sustainable Development, Dagestan State University, Makhachkala, Russia
- Caspian Centre for Nature Conservation, International Institute of Ecology and Sustainable Development, Association of Universities and Research Centers of Caspian Region States, Makhachkala, Russia
| | - Kirill Sharshov
- Research Institute of Virology, Federal Research Centre for Fundamental and Translational Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
| | - Ivan Sobolev
- Research Institute of Virology, Federal Research Centre for Fundamental and Translational Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
| | - Alexander Alekseev
- Institute of Ecology and Sustainable Development, Dagestan State University, Makhachkala, Russia
- Research Institute of Virology, Federal Research Centre for Fundamental and Translational Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
| | - Marina Gulyaeva
- Department of Natural Sciences, Novosibirsk State University, Novosibirsk, Russia
| | - Kirill Litvinov
- Laboratory of Ecological and Biological Research, Astrakhan State Nature Biosphere Reserve, Astrakhan, Russia
| | - Ivan Boltunov
- Department of Vertebrate Zoology, Faculty of Biology, M.V. Lomonosov Moscow State University, Moscow, Russia
| | - Abdulgamid Teymurov
- Institute of Ecology and Sustainable Development, Dagestan State University, Makhachkala, Russia
| | - Alexander Zhigalin
- Institute of Ecology and Sustainable Development, Dagestan State University, Makhachkala, Russia
| | - Madina Daudova
- Institute of Ecology and Sustainable Development, Dagestan State University, Makhachkala, Russia
| | - Alexander Shestopalov
- Research Institute of Virology, Federal Research Centre for Fundamental and Translational Medicine, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
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de Bruin ACM, Spronken MI, Kok A, Rosu ME, de Meulder D, van Nieuwkoop S, Lexmond P, Funk M, Leijten LM, Bestebroer TM, Herfst S, van Riel D, Fouchier RAM, Richard M. Species-specific emergence of H7 highly pathogenic avian influenza virus is driven by intrahost selection differences between chickens and ducks. PLoS Pathog 2024; 20:e1011942. [PMID: 38408092 PMCID: PMC10919841 DOI: 10.1371/journal.ppat.1011942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 03/07/2024] [Accepted: 01/03/2024] [Indexed: 02/28/2024] Open
Abstract
Highly pathogenic avian influenza viruses (HPAIVs) cause severe hemorrhagic disease in terrestrial poultry and are a threat to the poultry industry, wild life, and human health. HPAIVs arise from low pathogenic avian influenza viruses (LPAIVs), which circulate in wild aquatic birds. HPAIV emergence is thought to occur in poultry and not wild aquatic birds, but the reason for this species-restriction is not known. We hypothesized that, due to species-specific tropism and replication, intrahost HPAIV selection is favored in poultry and disfavored in wild aquatic birds. We tested this hypothesis by co-inoculating chickens, representative of poultry, and ducks, representative of wild aquatic birds, with a mixture of H7N7 HPAIV and LPAIV, mimicking HPAIV emergence in an experimental setting. Virus selection was monitored in swabs and tissues by RT-qPCR and immunostaining of differential N-terminal epitope tags that were added to the hemagglutinin protein. HPAIV was selected in four of six co-inoculated chickens, whereas LPAIV remained the major population in co-inoculated ducks on the long-term, despite detection of infectious HPAIV in tissues at early time points. Collectively, our data support the hypothesis that HPAIVs are more likely to be selected at the intrahost level in poultry than in wild aquatic birds and point towards species-specific differences in HPAIV and LPAIV tropism and replication levels as possible explanations.
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Affiliation(s)
- Anja C. M. de Bruin
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Monique I. Spronken
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Adinda Kok
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Miruna E. Rosu
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Dennis de Meulder
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | | | - Pascal Lexmond
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Mathis Funk
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Lonneke M. Leijten
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Theo M. Bestebroer
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Sander Herfst
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Debby van Riel
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Ron A. M. Fouchier
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Mathilde Richard
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
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Simancas-Racines A, Cadena-Ullauri S, Guevara-Ramírez P, Zambrano AK, Simancas-Racines D. Avian Influenza: Strategies to Manage an Outbreak. Pathogens 2023; 12:pathogens12040610. [PMID: 37111496 PMCID: PMC10145843 DOI: 10.3390/pathogens12040610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 03/27/2023] [Accepted: 04/04/2023] [Indexed: 04/29/2023] Open
Abstract
Avian influenza (AI) is a contagious disease among the poultry population with high avian mortality, which generates significant economic losses and elevated costs for disease control and outbreak eradication. AI is caused by an RNA virus part of the Orthomyxoviridae family; however, only Influenzavirus A is capable of infecting birds. AI pathogenicity is based on the lethality, signs, and molecular characteristics of the virus. Low pathogenic avian influenza (LPAI) virus has a low mortality rate and ability to infect, whereas the highly pathogenic avian influenza (HPAI) virus can cross respiratory and intestinal barriers, diffuse to the blood, damage all tissues of the bird, and has a high mortality rate. Nowadays, avian influenza is a global public health concern due to its zoonotic potential. Wild waterfowl is the natural reservoir of AI viruses, and the oral-fecal path is the main transmission route between birds. Similarly, transmission to other species generally occurs after virus circulation in densely populated infected avian species, indicating that AI viruses can adapt to promote the spread. Moreover, HPAI is a notifiable animal disease; therefore, all countries must report infections to the health authorities. Regarding laboratory diagnoses, the presence of influenza virus type A can be identified by agar gel immunodiffusion (AGID), enzyme immunoassay (EIA), immunofluorescence assays, and enzyme-linked immunoadsorption assay (ELISAs). Furthermore, reverse transcription polymerase chain reaction is used for viral RNA detection and is considered the gold standard for the management of suspect and confirmed cases of AI. If there is suspicion of a case, epidemiological surveillance protocols must be initiated until a definitive diagnosis is obtained. Moreover, if there is a confirmed case, containment actions should be prompt and strict precautions must be taken when handling infected poultry cases or infected materials. The containment measures for confirmed cases include the sanitary slaughter of infected poultry using methods such as environment saturation with CO2, carbon dioxide foam, and cervical dislocation. For disposal, burial, and incineration, protocols should be followed. Lastly, disinfection of affected poultry farms must be carried out. The present review aims to provide an overview of the avian influenza virus, strategies for its management, the challenges an outbreak can generate, and recommendations for informed decision making.
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Affiliation(s)
- Alison Simancas-Racines
- Facultad de Ciencias Agropecuarias y Recursos Naturales, Carrera de Medicina Veterinaria Universidad Técnica de Cotopaxi, Latacunga 050108, Ecuador
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito 170129, Ecuador
- Centro de Investigación de Salud Pública y Epidemiología Clínica (CISPEC), Universidad UTE, Quito 170129, Ecuador
| | - Santiago Cadena-Ullauri
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito 170129, Ecuador
| | - Patricia Guevara-Ramírez
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito 170129, Ecuador
| | - Ana Karina Zambrano
- Centro de Investigación Genética y Genómica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito 170129, Ecuador
| | - Daniel Simancas-Racines
- Centro de Investigación de Salud Pública y Epidemiología Clínica (CISPEC), Universidad UTE, Quito 170129, Ecuador
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Hubálek Z. Pathogenic microorganisms associated with gulls and terns (Laridae). JOURNAL OF VERTEBRATE BIOLOGY 2021. [DOI: 10.25225/jvb.21009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Zdeněk Hubálek
- Institute of Vertebrate Biology of the Czech Academy of Sciences, Brno, Czech Republic; e-mail:
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5
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Caliendo V, Leijten L, Begeman L, Poen MJ, Fouchier RAM, Beerens N, Kuiken T. Enterotropism of highly pathogenic avian influenza virus H5N8 from the 2016/2017 epidemic in some wild bird species. Vet Res 2020; 51:117. [PMID: 32928280 PMCID: PMC7491185 DOI: 10.1186/s13567-020-00841-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 09/02/2020] [Indexed: 12/17/2022] Open
Abstract
In 2016/2017, H5N8 highly pathogenic avian influenza (HPAI) virus of the Goose/Guangdong lineage spread from Asia to Europe, causing the biggest and most widespread HPAI epidemic on record in wild and domestic birds in Europe. We hypothesized that the wide dissemination of the 2016 H5N8 virus resulted at least partly from a change in tissue tropism from the respiratory tract, as in older HPAIV viruses, to the intestinal tract, as in low pathogenic avian influenza (LPAI) viruses, allowing more efficient faecal-oral transmission. Therefore, we determined the tissue tropism and associated lesions in wild birds found dead during the 2016 H5N8 epidemic, as well as the pattern of attachment of 2016 H5N8 virus to respiratory and intestinal tissues of four key wild duck species. We found that, out of 39 H5N8-infected wild birds of 12 species, four species expressed virus antigen in both respiratory and intestinal epithelium, one species only in respiratory epithelium, and one species only in intestinal epithelium. Virus antigen expression was association with inflammation and necrosis in multiple tissues. The level of attachment to wild duck intestinal epithelia of 2016 H5N8 virus was comparable to that of LPAI H4N5 virus, and higher than that of 2005 H5N1 virus for two of the four duck species and chicken tested. Overall, these results indicate that 2016 H5N8 may have acquired a similar enterotropism to LPAI viruses, without having lost the respirotropism of older HPAI viruses of the Goose/Guangdong lineage. The increased enterotropism of 2016 H5N8 implies that this virus had an increased chance to persist long term in the wild waterbird reservoir.
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Affiliation(s)
- Valentina Caliendo
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Lonneke Leijten
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Lineke Begeman
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Marjolein J Poen
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Ron A M Fouchier
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Nancy Beerens
- Department of Virology, Wageningen Bioveterinary Research, Lelystad, The Netherlands
| | - Thijs Kuiken
- Department of Viroscience, Erasmus Medical Center, Rotterdam, The Netherlands.
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6
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Campbell LK, Magor KE. Pattern Recognition Receptor Signaling and Innate Responses to Influenza A Viruses in the Mallard Duck, Compared to Humans and Chickens. Front Cell Infect Microbiol 2020; 10:209. [PMID: 32477965 PMCID: PMC7236763 DOI: 10.3389/fcimb.2020.00209] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 04/16/2020] [Indexed: 12/25/2022] Open
Abstract
Mallard ducks are a natural host and reservoir of avian Influenza A viruses. While most influenza strains can replicate in mallards, the virus typically does not cause substantial disease in this host. Mallards are often resistant to disease caused by highly pathogenic avian influenza viruses, while the same strains can cause severe infection in humans, chickens, and even other species of ducks, resulting in systemic spread of the virus and even death. The differences in influenza detection and antiviral effectors responsible for limiting damage in the mallards are largely unknown. Domestic mallards have an early and robust innate response to infection that seems to limit replication and clear highly pathogenic strains. The regulation and timing of the response to influenza also seems to circumvent damage done by a prolonged or dysregulated immune response. Rapid initiation of innate immune responses depends on viral recognition by pattern recognition receptors (PRRs) expressed in tissues where the virus replicates. RIG-like receptors (RLRs), Toll-like receptors (TLRs), and Nod-like receptors (NLRs) are all important influenza sensors in mammals during infection. Ducks utilize many of the same PRRs to detect influenza, namely RIG-I, TLR7, and TLR3 and their downstream adaptors. Ducks also express many of the same signal transduction proteins including TBK1, TRIF, and TRAF3. Some antiviral effectors expressed downstream of these signaling pathways inhibit influenza replication in ducks. In this review, we summarize the recent advances in our understanding of influenza recognition and response through duck PRRs and their adaptors. We compare basal tissue expression and regulation of these signaling components in birds, to better understand what contributes to influenza resistance in the duck.
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Affiliation(s)
- Lee K Campbell
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada.,Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada
| | - Katharine E Magor
- Department of Biological Sciences, University of Alberta, Edmonton, AB, Canada.,Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada
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7
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Venkatesh D, Bianco C, Núñez A, Collins R, Thorpe D, Reid SM, Brookes SM, Essen S, McGinn N, Seekings J, Cooper J, Brown IH, Lewis NS. Detection of H3N8 influenza A virus with multiple mammalian-adaptive mutations in a rescued Grey seal ( Halichoerus grypus) pup. Virus Evol 2020; 6:veaa016. [PMID: 32211197 PMCID: PMC7079721 DOI: 10.1093/ve/veaa016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Avian influenza A viruses (IAVs) in different species of seals display a spectrum of pathogenicity, from sub-clinical infection to mass mortality events. Here we present an investigation of avian IAV infection in a 3- to 4-month-old Grey seal (Halichoerus grypus) pup, rescued from St Michael's Mount, Cornwall in 2017. The pup underwent medical treatment but died after two weeks; post-mortem examination and histology indicated sepsis as the cause of death. IAV NP antigen was detected by immunohistochemistry in the nasal mucosa, and sensitive real-time reverse transcription polymerase chain reaction assays detected trace amounts of viral RNA within the lower respiratory tract, suggesting that the infection may have been cleared naturally. IAV prevalence among Grey seals may therefore be underestimated. Moreover, contact with humans during the rescue raised concerns about potential zoonotic risk. Nucleotide sequencing revealed the virus to be of subtype H3N8. Combining a GISAID database BLAST search and time-scaled phylogenetic analyses, we inferred that the seal virus originated from an unsampled, locally circulating (in Northern Europe) viruses, likely from wild Anseriformes. From examining the protein alignments, we found several residue changes in the seal virus that did not occur in the bird viruses, including D701N in the PB2 segment, a rare mutation, and a hallmark of mammalian adaptation of bird viruses. IAVs of H3N8 subtype have been noted for their particular ability to cross the species barrier and cause productive infections, including historical records suggesting that they may have caused the 1889 pandemic. Therefore, infections such as the one we report here may be of interest to pandemic surveillance and risk and help us better understand the determinants and drivers of mammalian adaptation in influenza.
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Affiliation(s)
- Divya Venkatesh
- Department of Pathobiology and Population Scienes, Royal Veterinary College, Hawkshead Lane, Hatfield, Hertfordshire, AL9 7TA, UK
| | - Carlo Bianco
- Pathology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
- Diagnostic & Consultant Avian Pathology, Pathology Department, Animal and Plant Health Agency (APHA-Lasswade), Pentlands Science Park, Bush Loan, Penicuik, Midlothian EH26 0PZ, UK
| | - Alejandro Núñez
- Pathology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
| | - Rachael Collins
- Starcross Veterinary Investigation Centre, Animal and Plant Health Agency, Staplake Mount, Starcross, Devon, EX6 8PE, UK
| | - Darryl Thorpe
- British Divers Marine Life Rescue, Lime House, Regency Close, Uckfield, East Sussex TN22 1DS, UK
| | - Scott M Reid
- Virology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
| | - Sharon M Brookes
- Virology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
| | - Steve Essen
- Virology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
- OIE/FAO/EURL International Reference Laboratory for avian influenza, swine influenza and Newcastle Disease, Animal and Plant Health Agency (APHA) - Weybridge, Addlestone, Surrey, KT15 3NB, UK
| | - Natalie McGinn
- Virology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
- OIE/FAO/EURL International Reference Laboratory for avian influenza, swine influenza and Newcastle Disease, Animal and Plant Health Agency (APHA) - Weybridge, Addlestone, Surrey, KT15 3NB, UK
| | - James Seekings
- Virology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
- OIE/FAO/EURL International Reference Laboratory for avian influenza, swine influenza and Newcastle Disease, Animal and Plant Health Agency (APHA) - Weybridge, Addlestone, Surrey, KT15 3NB, UK
| | - Jayne Cooper
- Virology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
| | - Ian H Brown
- Virology Department, Animal and Plant Health Agency (APHA-Weybridge), Woodham Lane, New Haw, Addlestone KT15 3NB, UK
- OIE/FAO/EURL International Reference Laboratory for avian influenza, swine influenza and Newcastle Disease, Animal and Plant Health Agency (APHA) - Weybridge, Addlestone, Surrey, KT15 3NB, UK
| | - Nicola S Lewis
- Department of Pathobiology and Population Scienes, Royal Veterinary College, Hawkshead Lane, Hatfield, Hertfordshire, AL9 7TA, UK
- OIE/FAO/EURL International Reference Laboratory for avian influenza, swine influenza and Newcastle Disease, Animal and Plant Health Agency (APHA) - Weybridge, Addlestone, Surrey, KT15 3NB, UK
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Nuñez IA, Ross TM. A review of H5Nx avian influenza viruses. Ther Adv Vaccines Immunother 2019; 7:2515135518821625. [PMID: 30834359 PMCID: PMC6391539 DOI: 10.1177/2515135518821625] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 11/09/2018] [Indexed: 12/12/2022] Open
Abstract
Highly pathogenic avian influenza viruses (HPAIVs), originating from the A/goose/Guangdong/1/1996 H5 subtype, naturally circulate in wild-bird populations, particularly waterfowl, and often spill over to infect domestic poultry. Occasionally, humans are infected with HPAVI H5N1 resulting in high mortality, but no sustained human-to-human transmission. In this review, the replication cycle, pathogenicity, evolution, spread, and transmission of HPAIVs of H5Nx subtypes, along with the host immune responses to Highly Pathogenic Avian Influenza Virus (HPAIV) infection and potential vaccination, are discussed. In addition, the potential mechanisms for Highly Pathogenic Avian Influenza Virus (HPAIV) H5 Reassorted Viruses H5N1, H5N2, H5N6, H5N8 (H5Nx) viruses to transmit, infect, and adapt to the human host are reviewed.
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Affiliation(s)
- Ivette A. Nuñez
- Center for Vaccines and Immunology, University of Georgia, Athens, Georgia, USA
| | - Ted M. Ross
- Center for Vaccines and Immunology, University of Georgia, 501 D.W. Brooks Drive, CVI Room 1504, Athens, GA 30602, USA
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9
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Innate Immune Responses to Avian Influenza Viruses in Ducks and Chickens. Vet Sci 2019; 6:vetsci6010005. [PMID: 30634569 PMCID: PMC6466002 DOI: 10.3390/vetsci6010005] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Revised: 12/26/2018] [Accepted: 01/04/2019] [Indexed: 02/06/2023] Open
Abstract
Mallard ducks are important natural hosts of low pathogenic avian influenza (LPAI) viruses and many strains circulate in this reservoir and cause little harm. Some strains can be transmitted to other hosts, including chickens, and cause respiratory and systemic disease. Rarely, these highly pathogenic avian influenza (HPAI) viruses cause disease in mallards, while chickens are highly susceptible. The long co-evolution of mallard ducks with influenza viruses has undoubtedly fine-tuned many immunological host–pathogen interactions to confer resistance to disease, which are poorly understood. Here, we compare innate responses to different avian influenza viruses in ducks and chickens to reveal differences that point to potential mechanisms of disease resistance. Mallard ducks are permissive to LPAI replication in their intestinal tissues without overtly compromising their fitness. In contrast, the mallard response to HPAI infection reflects an immediate and robust induction of type I interferon and antiviral interferon stimulated genes, highlighting the importance of the RIG-I pathway. Ducks also appear to limit the duration of the response, particularly of pro-inflammatory cytokine expression. Chickens lack RIG-I, and some modulators of the signaling pathway and may be compromised in initiating an early interferon response, allowing more viral replication and consequent damage. We review current knowledge about innate response mediators to influenza infection in mallard ducks compared to chickens to gain insight into protective immune responses, and open questions for future research.
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10
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Gonzales JL, Roberts H, Smietanka K, Baldinelli F, Ortiz-Pelaez A, Verdonck F. Assessment of low pathogenic avian influenza virus transmission via raw poultry meat and raw table eggs. EFSA J 2018; 16:e05431. [PMID: 32625713 PMCID: PMC7009628 DOI: 10.2903/j.efsa.2018.5431] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A rapid qualitative assessment has been done by performing a theoretical analysis on the transmission of low pathogenic avian influenza (LPAI) via fresh meat from poultry reared or kept in captivity for the production of meat (raw poultry meat) or raw table eggs. A predetermined transmission pathway followed a number of steps from a commercial or non-commercial poultry establishment within the EU exposed to LPAI virus (LPAIV) to the onward virus transmission to animals and humans. The combined probability of exposure and subsequent LPAIV infection via raw poultry meat containing LPAIV is negligible for commercial poultry and humans exposed via consumption whereas it is very unlikely for non-commercial poultry, wild birds and humans exposed via handling and manipulation. The probability of LPAIV transmission from an individual infected via raw poultry meat containing LPAIV is negligible for commercial poultry and humans, whereas it is very unlikely for non-commercial poultry and wild birds. The combined probability of exposure and subsequent LPAIV infection via raw table eggs containing LPAIV is negligible for commercial poultry and humans and extremely unlikely to negligible for non-commercial poultry and wild birds. The probability of LPAIV transmission from an individual infected via raw table eggs containing LPAIV is negligible for commercial poultry and humans and very unlikely to negligible for non-commercial poultry and wild birds. Although the presence of LPAIV in raw poultry meat and table eggs is very unlikely to negligible, there is in general a high level of uncertainty on the estimation of the subsequent probabilities of key steps of the transmission pathways for poultry and wild birds, mainly due to the limited number of studies available, for instance on the viral load required to infect a bird via raw poultry meat or raw table eggs containing LPAIV.
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11
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Umar S, Guerin JL, Ducatez MF. Low Pathogenic Avian Influenza and Coinfecting Pathogens: A Review of Experimental Infections in Avian Models. Avian Dis 2017; 61:3-15. [PMID: 28301244 DOI: 10.1637/11514-101316-review] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Low pathogenic avian influenza virus (LPAIV) usually causes mild disease or asymptomatic infection in poultry. LPAIV has, however, become a great threat to poultry industry due to mixed infections with other pathogens. Coinfections do frequently occur in the field but are not easily detected, and their impact on pathobiology is not clearly defined due to their complicated nature, but it is well known that there is an impact. One way to increase our knowledge of coinfections in poultry is to challenge birds in experimental and controlled conditions. While many articles report in vivo experiments with LPAIV in avian models, only a few have studied coinfections. Moreover, researchers tend to choose different bird types, ages, inoculation routes, and doses for their experiments, making it difficult to compare between studies. This review describes the state of the art for experimental infections with LPAIV alone or associated with coinfecting pathogens in avian models. It also discusses how best to mimic field infections in laboratory settings. In the field of avian diseases, experimental design is obviously directly linked with the research question addressed, but there is a gap between field and experimental data, and further studies are warranted to better understand how to bring laboratory settings closer to field situations.
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Affiliation(s)
- Sajid Umar
- IHAP, Université de Toulouse, INRA, ENVT, 23 Chemin des Capelles, 37076 Toulouse, France
| | - Jean Luc Guerin
- IHAP, Université de Toulouse, INRA, ENVT, 23 Chemin des Capelles, 37076 Toulouse, France
| | - Mariette F Ducatez
- IHAP, Université de Toulouse, INRA, ENVT, 23 Chemin des Capelles, 37076 Toulouse, France
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12
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More S, Bøtner A, Butterworth A, Calistri P, Depner K, Edwards S, Garin-Bastuji B, Good M, Gortázar Schmidt C, Michel V, Miranda MA, Nielsen SS, Raj M, Sihvonen L, Spoolder H, Stegeman JA, Thulke HH, Velarde A, Willeberg P, Winckler C, Baldinelli F, Broglia A, Verdonck F, Beltrán Beck B, Kohnle L, Morgado J, Bicout D. Assessment of listing and categorisation of animal diseases within the framework of the Animal Health Law (Regulation (EU) No 2016/429): low pathogenic avian influenza. EFSA J 2017; 15:e04891. [PMID: 32625556 PMCID: PMC7009921 DOI: 10.2903/j.efsa.2017.4891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Low pathogenic avian influenza (LPAI) has been assessed according to the criteria of the Animal Health Law (AHL), in particular criteria of Article 7 on disease profile and impacts, Article 5 on the eligibility of LPAI to be listed, Article 9 for the categorisation of LPAI according to disease prevention and control rules as in Annex IV and Article 8 on the list of animal species related to LPAI. The assessment has been performed following a methodology composed of information collection and compilation, expert judgement on each criterion at individual and, if no consensus was reached before, also at collective levels. The output is composed of the categorical answer, and for the questions where no consensus was reached, the different supporting views are reported. Details on the methodology used for this assessment are explained in a separate opinion. According to the assessment performed, LPAI can be considered eligible to be listed for Union intervention as laid down in Article 5(3) of the AHL. The disease would comply with the criteria as in Sections 3 and 5 of Annex IV of the AHL, for the application of the disease prevention and control rules referred to in points (c) and (e) of Article 9(1). The animal species to be listed for LPAI according to Article 8(3) criteria are all species of domestic poultry and wild species of mainly Anseriformes and Charadriiformes, as indicated in the present opinion.
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Verhagen JH, Lexmond P, Vuong O, Schutten M, Guldemeester J, Osterhaus ADME, Elbers ARW, Slaterus R, Hornman M, Koch G, Fouchier RAM. Discordant detection of avian influenza virus subtypes in time and space between poultry and wild birds; Towards improvement of surveillance programs. PLoS One 2017; 12:e0173470. [PMID: 28278281 PMCID: PMC5344487 DOI: 10.1371/journal.pone.0173470] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 02/22/2017] [Indexed: 11/27/2022] Open
Abstract
Avian influenza viruses from wild birds can cause outbreaks in poultry, and occasionally infect humans upon exposure to infected poultry. Identification and characterization of viral reservoirs and transmission routes is important to develop strategies that prevent infection of poultry, and subsequently virus transmission between poultry holdings and to humans. Based on spatial, temporal and phylogenetic analyses of data generated as part of intense and large-scale influenza surveillance programs in wild birds and poultry in the Netherlands from 2006 to 2011, we demonstrate that LPAIV subtype distribution differed between wild birds and poultry, suggestive of host-range restrictions. LPAIV isolated from Dutch poultry were genetically most closely related to LPAIV isolated from wild birds in the Netherlands or occasionally elsewhere in Western Europe. However, a relatively long time interval was observed between the isolations of related viruses from wild birds and poultry. Spatial analyses provided evidence for mallards (Anas platyrhynchos) being more abundant near primary infected poultry farms. Detailed year-round investigation of virus prevalence and wild bird species distribution and behavior near poultry farms should be used to improve risk assessment in relation to avian influenza virus introduction and retarget avian influenza surveillance programs.
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Affiliation(s)
| | - Pascal Lexmond
- Department of Viroscience, Erasmus MC, Rotterdam, the Netherlands
| | - Oanh Vuong
- Department of Viroscience, Erasmus MC, Rotterdam, the Netherlands
| | - Martin Schutten
- Department of Viroscience, Erasmus MC, Rotterdam, the Netherlands
| | | | | | - Armin R. W. Elbers
- Central Veterinary Institute part of Wageningen UR, Lelystad, the Netherlands
| | - Roy Slaterus
- Sovon, Dutch Centre for Field Ornithology, Nijmegen, the Netherlands
| | - Menno Hornman
- Sovon, Dutch Centre for Field Ornithology, Nijmegen, the Netherlands
| | - Guus Koch
- Central Veterinary Institute part of Wageningen UR, Lelystad, the Netherlands
| | - Ron A. M. Fouchier
- Department of Viroscience, Erasmus MC, Rotterdam, the Netherlands
- * E-mail:
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14
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Wille M, Latorre-Margalef N, Tolf C, Stallknecht DE, Waldenström J. No evidence for homosubtypic immunity of influenza H3 in Mallards following vaccination in a natural experimental system. Mol Ecol 2017; 26:1420-1431. [PMID: 27997047 PMCID: PMC5347849 DOI: 10.1111/mec.13967] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 12/07/2016] [Accepted: 12/08/2016] [Indexed: 11/28/2022]
Abstract
The Mallard (Anas platyrhynchos) is an important reservoir species for influenza A viruses (IAV), and in this host, prevalence and virus diversity are high. Studies have demonstrated the presence of homosubtypic immunity, where individuals are unlikely to be reinfected with the same subtype within an autumn season. Further, evidence for heterosubtypic immunity exists, whereby immune responses specific for one subtype offer partial or complete protection against related HA subtypes. We utilized a natural experimental system to determine whether homo- or heterospecific immunity could be induced following experimental vaccination. Thirty Mallards were vaccinated with an inactivated H3, H6 or a sham vaccine and after seroconversion were exposed to naturally infected wild conspecifics. All ducks were infected within 2 days and had both primary and secondary infections. Overall, there was no observable difference between groups; all individuals were infected with H3 and H10 IAV. At the cessation of the experiment, most individuals had anti-NP antibodies and neutralizing antibodies against H10. Not all individuals had H3 neutralizing antibodies. The isolated H3 IAVs revealed genetic dissimilarity to the H3 vaccine strain, specifically substitutions in the vicinity of the receptor-binding site. There was no evidence of vaccine-induced homosubtypic immunity to H3, a likely result of both a poor H3 immune response in the ducks and H3 immune escape. Likewise, there was no observed heterosubtypic protection related to H6 vaccination. This study highlights the need for experimental approaches to assess how exposure to pathogens and resulting immune processes translates to individual and population disease dynamics.
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Affiliation(s)
- M Wille
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, SE-391 82, Kalmar, Sweden
| | - N Latorre-Margalef
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, SE-391 82, Kalmar, Sweden.,Southeastern Cooperative Wildlife Disease Study, Department of Population Health, College of Veterinary Medicine, Department of Population Health, The University of Georgia, Athens, GA, 30602, USA
| | - C Tolf
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, SE-391 82, Kalmar, Sweden
| | - D E Stallknecht
- Southeastern Cooperative Wildlife Disease Study, Department of Population Health, College of Veterinary Medicine, Department of Population Health, The University of Georgia, Athens, GA, 30602, USA
| | - J Waldenström
- Centre for Ecology and Evolution in Microbial Model Systems, Linnaeus University, SE-391 82, Kalmar, Sweden
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15
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Kaiser A, Willer T, Sid H, Petersen H, Baumgärtner W, Steinberg P, Rautenschlein S. Susceptibility of primary chicken intestinal epithelial cells for low pathogenic avian influenza virus and velogenic viscerotropic Newcastle disease virus. Virus Res 2016; 225:50-63. [DOI: 10.1016/j.virusres.2016.09.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Revised: 07/01/2016] [Accepted: 09/02/2016] [Indexed: 11/25/2022]
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Hill NJ, Runstadler JA. A Bird's Eye View of Influenza A Virus Transmission: Challenges with Characterizing Both Sides of a Co-Evolutionary Dynamic. Integr Comp Biol 2016; 56:304-16. [PMID: 27252222 PMCID: PMC5964799 DOI: 10.1093/icb/icw055] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
In nature, wild birds and influenza A viruses (IAV) are continually co-evolving, locked into a back-and-forth of resistance and conquest that has approached a stable equilibrium over time. This co-evolutionary relationship between bird host and IAV may appear stable at the organismal level, but is highly dynamic at the molecular level manifesting in a constant trade-off between transmissibility and virulence of the virus. Characterizing both sides of the host-virus dynamic has presented a challenge for ecologists and virologists alike, despite the potential for this approach to provide insights into which conditions destabilize the equilibrium state resulting in outbreaks or mortality of hosts in extreme cases. The use of different methods that are either host-centric or virus-centric has made it difficult to reconcile the disparate fields of host ecology and virology for investigating and ultimately predicting wild bird-mediated transmission of IAV. This review distills some of the key lessons learned from virological and ecological studies and explores the promises and pitfalls of both approaches. Ultimately, reconciling ecological and virological approaches hinges on integrating scales for measuring host-virus interactions. We argue that prospects for finding common scales for measuring wild bird-influenza dynamics are improving due to advances in genomic sequencing, host-tracking technology and remote sensing data, with the unit of time (months, year, or seasons) providing a starting point for crossover.
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Affiliation(s)
- Nichola J Hill
- Massachusetts Institute of Technology, Division of Comparative Medicine & Department of Biological Engineering, 77 Massachusetts Ave, Cambridge 02139
| | - Jonathan A Runstadler
- Massachusetts Institute of Technology, Division of Comparative Medicine & Department of Biological Engineering, 77 Massachusetts Ave, Cambridge 02139
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Verhagen JH, van Dijk JGB, Vuong O, Bestebroer T, Lexmond P, Klaassen M, Fouchier RAM. Migratory birds reinforce local circulation of avian influenza viruses. PLoS One 2014; 9:e112366. [PMID: 25391154 PMCID: PMC4229208 DOI: 10.1371/journal.pone.0112366] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2014] [Accepted: 10/08/2014] [Indexed: 11/24/2022] Open
Abstract
Migratory and resident hosts have been hypothesized to fulfil distinct roles in infectious disease dynamics. However, the contribution of resident and migratory hosts to wildlife infectious disease epidemiology, including that of low pathogenic avian influenza virus (LPAIV) in wild birds, has largely remained unstudied. During an autumn H3 LPAIV epizootic in free-living mallards (Anas platyrhynchos) — a partially migratory species — we identified resident and migratory host populations using stable hydrogen isotope analysis of flight feathers. We investigated the role of migratory and resident hosts separately in the introduction and maintenance of H3 LPAIV during the epizootic. To test this we analysed (i) H3 virus kinship, (ii) temporal patterns in H3 virus prevalence and shedding and (iii) H3-specific antibody prevalence in relation to host migratory strategy. We demonstrate that the H3 LPAIV strain causing the epizootic most likely originated from a single introduction, followed by local clonal expansion. The H3 LPAIV strain was genetically unrelated to H3 LPAIV detected both before and after the epizootic at the study site. During the LPAIV epizootic, migratory mallards were more often infected with H3 LPAIV than residents. Low titres of H3-specific antibodies were detected in only a few residents and migrants. Our results suggest that in this LPAIV epizootic, a single H3 virus was present in resident mallards prior to arrival of migratory mallards followed by a period of virus amplification, importantly associated with the influx of migratory mallards. Thus migrants are suggested to act as local amplifiers rather than the often suggested role as vectors importing novel strains from afar. Our study exemplifies that a multifaceted interdisciplinary approach offers promising opportunities to elucidate the role of migratory and resident hosts in infectious disease dynamics in wildlife.
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Affiliation(s)
| | - Jacintha G. B. van Dijk
- Department of Animal Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
| | - Oanh Vuong
- Department of Viroscience, Erasmus MC, Rotterdam, The Netherlands
| | - Theo Bestebroer
- Department of Viroscience, Erasmus MC, Rotterdam, The Netherlands
| | - Pascal Lexmond
- Department of Viroscience, Erasmus MC, Rotterdam, The Netherlands
| | - Marcel Klaassen
- Department of Animal Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, The Netherlands
- Centre for Integrative Ecology, School of Life and Environmental Sciences, Deakin University, Geelong, Australia
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Fereidouni SR, Harder TC, Globig A, Starick E. Failure of productive infection of Mallards (Anas platyrhynchos) with H16 subtype of avian influenza viruses. Influenza Other Respir Viruses 2014; 8:613-6. [PMID: 25205059 PMCID: PMC4262275 DOI: 10.1111/irv.12275] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/11/2014] [Indexed: 11/28/2022] Open
Abstract
Background Mallard ducks and other waterfowl represent the most important reservoirs of low pathogenic avian influenza viruses (LPAIV). In addition, mallards are the most abundant duck species in Eurasia that migrate over long distances. Despite extended wild bird monitoring studies over the past decade in many Eurasian countries and investigating hundreds of thousands of wild bird samples, no mallard duck was found to be positive for avian influenza virus of subtype H16 in faecal, cloacal or oropharyngeal samples. Just three cases of H16 infections in Anseriformes species were described worldwide. In contrast, H16 viruses have been repeatedly isolated from birds of the Laridae family. Objective Here, we tested the hypothesis that mallards are less permissive to infection with H16 viruses. Methods Groups of mallard ducks of different age were inoculated via the oculo-nasal-oral route with different infectious doses of an H16N3 AIV. Results The ducks did not show any clinical symptoms, and no virus shedding was evident from cloacal and respiratory routes after experimental infection as shown by negative RT-qPCR results. In addition, all serum samples taken on days 8, 21 and 24 post-inoculation were negative by competitive NP-ELISA. Conclusions This study provided evidence that mallards are resistant to infection with H16N3 LPAIV.
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Wille M, van Run P, Waldenström J, Kuiken T. Infected or not: are PCR-positive oropharyngeal swabs indicative of low pathogenic influenza A virus infection in the respiratory tract of Mallard Anas platyrhynchos? Vet Res 2014; 45:53. [PMID: 24885647 PMCID: PMC4046040 DOI: 10.1186/1297-9716-45-53] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Accepted: 04/24/2014] [Indexed: 12/02/2022] Open
Abstract
Detection of influenza virus in oropharyngeal swabs collected during wild bird surveillance is assumed to represent respiratory infection, although intestine is the main site of infection. We tested this assumption by histological examination of the respiratory tract of wild Mallards with virus-positive oropharyngeal swabs. Thirty-two of 125 Mallards tested had viral-RNA positive oropharyngeal swabs. The respiratory tracts of four Mallards with the most virus were examined in detail by immunohistochemistry. None had detectable virus antigen in the respiratory tract, suggesting it was not infected. An alternative explanation is that the oropharynx was contaminated with virus through feeding in surface water or through preening.
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Affiliation(s)
| | | | | | - Thijs Kuiken
- Department of Viroscience, Erasmus Medical Centre, Dr, Molewaterplein 50, 3015 GE Rotterdam, The Netherlands.
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Abstract
Although low pathogenic avian influenza virus (LPAIV) is traditionally considered to have adapted to its wild waterbird host to become avirulent, recent studies have suggested that LPAIV infection might after all have clinical effects. Therefore, I reviewed the literature on LPAIV infections in wild waterbirds. The virulence of LPAIV was assessed in 17 studies on experimental infections and nine studies on natural infections. Reported evidence for virulence were reductions in return rate, feeding rate, body weight, long-range movement and reproductive success, as well as pathological changes in infected organs. However, major caveats in studies of experimental infections were unnatural route of LPAIV inoculation, animal husbandry not simulating natural stressors and low sensitivity of clinical assessment. Major caveats in studies of natural infections were incomplete measurement of LPAIV infection burden, quasi-experimental design and potential misclassification of birds. After taking these caveats into account, the only remaining evidence for virulence was that presence and intensity of LPAIV infection were negatively correlated with body weight. Based on this correlation, together with the demonstrated LPAIV tropism for the intestinal tract, I hypothesize that LPAIV reduces digestive tract function, and suggest how future studies could be directed to test this hypothesis.
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Affiliation(s)
- Thijs Kuiken
- Department of Viroscience, Erasmus University Medical Centre, PO Box 2040, 3000 CA Rotterdam, The Netherlands.
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21
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Tønnessen R, Hauge AG, Hansen EF, Rimstad E, Jonassen CM. Host restrictions of avian influenza viruses: in silico analysis of H13 and H16 specific signatures in the internal proteins. PLoS One 2013; 8:e63270. [PMID: 23646204 PMCID: PMC3639990 DOI: 10.1371/journal.pone.0063270] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2012] [Accepted: 04/02/2013] [Indexed: 12/01/2022] Open
Abstract
Gulls are the primary hosts of H13 and H16 avian influenza viruses (AIVs). The molecular basis for this host restriction is only partially understood. In this study, amino acid sequences from Eurasian gull H13 and H16 AIVs and Eurasian AIVs (non H13 and H16) were compared to determine if specific signatures are present only in the internal proteins of H13 and H16 AIVs, using a bioinformatics approach. Amino acids identified in an initial analysis performed on 15 selected sequences were checked against a comprehensive set of AIV sequences retrieved from Genbank to verify them as H13 and H16 specific signatures. Analysis of protein similarities and prediction of subcellular localization signals were performed to search for possible functions associated with the confirmed signatures. H13 and H16 AIV specific signatures were found in all the internal proteins examined, but most were found in the non-structural protein 1 (NS1) and in the nucleoprotein. A putative functional signature was predicted to be present in the nuclear export protein. Moreover, it was predicted that the NS1 of H13 and H16 AIVs lack one of the nuclear localization signals present in NS1 of other AIV subtypes. These findings suggest that the signatures found in the internal proteins of H13 and H16 viruses are possibly related to host restriction.
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Affiliation(s)
- Ragnhild Tønnessen
- Department of Food Safety and Infection Biology, Norwegian School of Veterinary Science, Oslo, Norway.
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