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Uddin Khan S, Atanasova KR, Krueger WS, Ramirez A, Gray GC. Epidemiology, geographical distribution, and economic consequences of swine zoonoses: a narrative review. Emerg Microbes Infect 2013; 2:e92. [PMID: 26038451 PMCID: PMC3880873 DOI: 10.1038/emi.2013.87] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 11/22/2013] [Accepted: 11/25/2013] [Indexed: 01/19/2023]
Abstract
We sought to review the epidemiology, international geographical distribution, and economic consequences of selected swine zoonoses. We performed literature searches in two stages. First, we identified the zoonotic pathogens associated with swine. Second, we identified specific swine-associated zoonotic pathogen reports for those pathogens from January 1980 to October 2012. Swine-associated emerging diseases were more prevalent in the countries of North America, South America, and Europe. Multiple factors were associated with the increase of swine zoonoses in humans including: the density of pigs, poor water sources and environmental conditions for swine husbandry, the transmissibility of the pathogen, occupational exposure to pigs, poor human sanitation, and personal hygiene. Swine zoonoses often lead to severe economic consequences related to the threat of novel pathogens to humans, drop in public demand for pork, forced culling of swine herds, and international trade sanctions. Due to the complexity of swine-associated pathogen ecology, designing effective interventions for early detection of disease, their prevention, and mitigation requires an interdisciplinary collaborative “One Health” approach from veterinarians, environmental and public health professionals, and the swine industry.
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Affiliation(s)
- Salah Uddin Khan
- Department of Environmental and Global Health, College of Public Health and Health Professions, University of Florida , Gainesville, FL 32611, USA ; Emerging Pathogens Institute, University of Florida , Gainesville, FL 32611, USA
| | - Kalina R Atanasova
- Department of Environmental and Global Health, College of Public Health and Health Professions, University of Florida , Gainesville, FL 32611, USA ; Emerging Pathogens Institute, University of Florida , Gainesville, FL 32611, USA
| | - Whitney S Krueger
- Department of Environmental and Global Health, College of Public Health and Health Professions, University of Florida , Gainesville, FL 32611, USA ; Emerging Pathogens Institute, University of Florida , Gainesville, FL 32611, USA
| | - Alejandro Ramirez
- Veterinary Diagnosis and Production Animal Medicine, Iowa State University , Iowa, IA 5011, USA
| | - Gregory C Gray
- Department of Environmental and Global Health, College of Public Health and Health Professions, University of Florida , Gainesville, FL 32611, USA ; Emerging Pathogens Institute, University of Florida , Gainesville, FL 32611, USA
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52
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Weis M, Behner L, Hoffmann M, Krüger N, Herrler G, Drosten C, Drexler JF, Dietzel E, Maisner A. Characterization of African bat henipavirus GH-M74a glycoproteins. J Gen Virol 2013; 95:539-548. [PMID: 24296468 DOI: 10.1099/vir.0.060632-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
In recent years, novel henipavirus-related sequences have been identified in bats in Africa. To evaluate the potential of African bat henipaviruses to spread in non-bat mammalian cells, we compared the biological functions of the surface glycoproteins G and F of the prototype African henipavirus GH-M74a with those of the glycoproteins of Nipah virus (NiV), a well-characterized pathogenic member of the henipavirus genus. Glycoproteins are central determinants for virus tropism, as efficient binding of henipavirus G proteins to cellular ephrin receptors and functional expression of fusion-competent F proteins are indispensable prerequisites for virus entry and cell-to-cell spread. In this study, we analysed the ability of the GH-M74a G and F proteins to cause cell-to-cell fusion in mammalian cell types readily permissive to NiV or Hendra virus infections. Except for limited syncytium formation in a bat cell line derived from Hypsignathus monstrosus, HypNi/1.1 cells, we did not observe any fusion. The highly restricted fusion activity was predominantly due to the F protein. Whilst GH-M74a G protein was found to interact with the main henipavirus receptor ephrin-B2 and induced syncytia upon co-expression with heterotypic NiV F protein, GH-M74a F protein did not cause evident fusion in the presence of heterotypic NiV G protein. Pulse-chase and surface biotinylation analyses revealed delayed F cleavage kinetics with a reduced expression of cleaved and fusion-active GH-M74a F protein on the cell surface. Thus, the F protein of GH-M74a showed a functional defect that is most likely caused by impaired trafficking leading to less efficient proteolytic activation and surface expression.
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Affiliation(s)
- Michael Weis
- Institute of Virology, Philipps University Marburg, Marburg, Germany
| | - Laura Behner
- Institute of Virology, Philipps University Marburg, Marburg, Germany
| | - Markus Hoffmann
- Institute of Virology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Nadine Krüger
- Institute of Virology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Georg Herrler
- Institute of Virology, University of Veterinary Medicine Hannover, Hannover, Germany
| | - Christian Drosten
- Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
| | - Jan Felix Drexler
- Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
| | - Erik Dietzel
- Institute of Virology, Philipps University Marburg, Marburg, Germany
| | - Andrea Maisner
- Institute of Virology, Philipps University Marburg, Marburg, Germany
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Surface glycoproteins of an African henipavirus induce syncytium formation in a cell line derived from an African fruit bat, Hypsignathus monstrosus. J Virol 2013; 87:13889-91. [PMID: 24067951 DOI: 10.1128/jvi.02458-13] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Serological screening and detection of genomic RNA indicates that members of the genus Henipavirus are present not only in Southeast Asia but also in African fruit bats. We demonstrate that the surface glycoproteins F and G of an African henipavirus (M74) induce syncytium formation in a kidney cell line derived from an African fruit bat, Hypsignathus monstrosus. Despite a less broad cell tropism, the M74 glycoproteins show functional similarities to glycoproteins of Nipah virus.
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Use of cross-reactive serological assays for detecting novel pathogens in wildlife: assessing an appropriate cutoff for henipavirus assays in African bats. J Virol Methods 2013; 193:295-303. [PMID: 23835034 DOI: 10.1016/j.jviromet.2013.06.030] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Revised: 06/13/2013] [Accepted: 06/21/2013] [Indexed: 12/23/2022]
Abstract
Reservoir hosts of novel pathogens are often identified or suspected as such on the basis of serological assay results, prior to the isolation of the pathogen itself. Serological assays might therefore be used outside of their original, validated scope in order to infer seroprevalences in reservoir host populations, until such time that specific diagnostic assays can be developed. This is particularly the case in wildlife disease research. The absence of positive and negative control samples and gold standard diagnostic assays presents challenges in determining an appropriate threshold, or 'cutoff', for the assay that enables differentiation between seronegative and seropositive individuals. Here, multiple methods were explored to determine an appropriate cutoff for a multiplexed microsphere assay that is used to detect henipavirus antibody binding in fruit bat plasma. These methods included calculating multiples of 'negative' control assay values, receiver operating characteristic curve analyses, and Bayesian mixture models to assess the distribution of assay outputs for classifying seropositive and seronegative individuals within different age classes. As for any diagnostic assay, the most appropriate cutoff determination method and value selected must be made according to the aims of the study. This study is presented as an example for others where reference samples, and assays that have been characterised previously, are absent.
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Dhondt KP, Horvat B. Henipavirus infections: lessons from animal models. Pathogens 2013; 2:264-87. [PMID: 25437037 PMCID: PMC4235719 DOI: 10.3390/pathogens2020264] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 04/02/2013] [Accepted: 04/04/2013] [Indexed: 11/16/2022] Open
Abstract
The Henipavirus genus contains two highly lethal viruses, the Hendra and Nipah viruses and one, recently discovered, apparently nonpathogenic member; Cedar virus. These three, negative-sense single-stranded RNA viruses, are hosted by fruit bats and use EphrinB2 receptors for entry into cells. The Hendra and Nipah viruses are zoonotic pathogens that emerged in the middle of 90s and have caused severe, and often fatal, neurologic and/or respiratory diseases in both humans and different animals; including spillover into equine and porcine species. Development of relevant models is critical for a better understanding of viral pathogenesis, generating new diagnostic tools, and assessing anti-viral therapeutics and vaccines. This review summarizes available data on several animal models where natural and/or experimental infection has been demonstrated; including pteroid bats, horses, pigs, cats, hamsters, guinea pigs, ferrets, and nonhuman primates. It recapitulates the principal features of viral pathogenesis in these animals and current knowledge on anti-viral immune responses. Lastly it describes the recently characterized murine animal model, which provides the possibility to use numerous and powerful tools available for mice to further decipher henipaviruses immunopathogenesis, prophylaxis, and treatment. The utility of different models to analyze important aspects of henipaviruses-induced disease in humans, potential routes of transmission, and therapeutic approaches are equally discussed.
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Affiliation(s)
- Kévin P Dhondt
- International Center for Infectiology Research, INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon 1, 21 Avenue T. Garnier, Lyon 69007, France.
| | - Branka Horvat
- International Center for Infectiology Research, INSERM U1111, CNRS UMR5308, Ecole Normale Supérieure de Lyon, University of Lyon 1, 21 Avenue T. Garnier, Lyon 69007, France.
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Abstract
Nipah (NiV) and Hendra (HeV) viruses are the deadliest human pathogens within the Paramyxoviridae family, which include human and animal pathogens of global biomedical importance. NiV and HeV infections cause respiratory and encephalitic illness with high mortality rates in humans. Henipaviruses (HNV) are the only Paramyxoviruses classified as biosafety level 4 (BSL4) pathogens due to their extreme pathogenicity, potential for bioterrorism, and lack of licensed vaccines and therapeutics. HNV use ephrin-B2 and ephrin-B3, highly conserved proteins, as viral entry receptors. This likely accounts for their unusually broad species tropism, and also provides opportunities to study how receptor usage, cellular tropism, and end-organ pathology relates to the pathobiology of HNV infections. The clinical and pathologic manifestations of NiV and HeV virus infections are reviewed in the chapters by Wong et al. and Geisbert et al. in this issue. Here, we will review the biology of the HNV receptors, and how receptor usage relates to HNV cell tropism in vitro and in vivo.
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Affiliation(s)
- Olivier Pernet
- Department of Microbiology, Immunology and Molecular Genetics, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1489, USA
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Weiss S, Nowak K, Fahr J, Wibbelt G, Mombouli JV, Parra HJ, Wolfe ND, Schneider BS, Leendertz FH. Henipavirus-related sequences in fruit bat bushmeat, Republic of Congo. Emerg Infect Dis 2013; 18:1536-7. [PMID: 22935105 PMCID: PMC3437727 DOI: 10.3201/eid1809.111607] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Clayton BA, Wang LF, Marsh GA. Henipaviruses: an updated review focusing on the pteropid reservoir and features of transmission. Zoonoses Public Health 2012; 60:69-83. [PMID: 22709528 DOI: 10.1111/j.1863-2378.2012.01501.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The henipaviruses, Hendra virus and Nipah virus, are pathogens that have emerged from flying foxes in Australia and South-east Asia to infect both livestock and humans, often fatally. Since the emergence of Hendra virus in Australia in 1994 and the identification of Australian flying foxes as hosts to this virus, our appreciation of bats as reservoir hosts of henipaviruses has expanded globally to include much of Asia and areas of Africa. Despite this, little is currently known of the mechanisms by which bats harbour viruses capable of causing such severe disease in other terrestrial mammals. Pteropid bat ecology, henipavirus virology, therapeutic developments and features of henipavirus infection, pathology and disease in humans and other mammals are reviewed elsewhere in detail. This review focuses on bats as reservoir hosts to henipaviruses and features of transmission of Hendra virus and Nipah virus following spillover from these reservoir hosts.
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Affiliation(s)
- B A Clayton
- CSIRO Livestock Industries, Australian Animal Health Laboratory, Geelong, Vic., Australia
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59
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Steffen DL, Xu K, Nikolov DB, Broder CC. Henipavirus mediated membrane fusion, virus entry and targeted therapeutics. Viruses 2012; 4:280-308. [PMID: 22470837 PMCID: PMC3315217 DOI: 10.3390/v4020280] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 01/30/2012] [Accepted: 01/30/2012] [Indexed: 11/23/2022] Open
Abstract
The Paramyxoviridae genus Henipavirus is presently represented by the type species Hendra and Nipah viruses which are both recently emerged zoonotic viral pathogens responsible for repeated outbreaks associated with high morbidity and mortality in Australia, Southeast Asia, India and Bangladesh. These enveloped viruses bind and enter host target cells through the coordinated activities of their attachment (G) and class I fusion (F) envelope glycoproteins. The henipavirus G glycoprotein interacts with host cellular B class ephrins, triggering conformational alterations in G that lead to the activation of the F glycoprotein, which facilitates the membrane fusion process. Using the recently published structures of HeV-G and NiV-G and other paramyxovirus glycoproteins, we review the features of the henipavirus envelope glycoproteins that appear essential for mediating the viral fusion process, including receptor binding, G-F interaction, F activation, with an emphasis on G and the mutations that disrupt viral infectivity. Finally, recent candidate therapeutics for henipavirus-mediated disease are summarized in light of their ability to inhibit HeV and NiV entry by targeting their G and F glycoproteins.
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Affiliation(s)
- Deborah L. Steffen
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA;
| | - Kai Xu
- Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA; (K.X.); (D.B.N.)
| | - Dimitar B. Nikolov
- Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA; (K.X.); (D.B.N.)
| | - Christopher C. Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA;
- Author to whom correspondence should be addressed; ; Tel.: +1-301-295-3401; Fax: +1-301-295-1545
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Peel AJ, Baker KS, Crameri G, Barr JA, Hayman DTS, Wright E, Broder CC, Fernández-Loras A, Fooks AR, Wang LF, Cunningham AA, Wood JLN. Henipavirus neutralising antibodies in an isolated island population of African fruit bats. PLoS One 2012; 7:e30346. [PMID: 22253928 PMCID: PMC3257271 DOI: 10.1371/journal.pone.0030346] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Accepted: 12/14/2011] [Indexed: 11/18/2022] Open
Abstract
Isolated islands provide valuable opportunities to study the persistence of viruses in wildlife populations, including population size thresholds such as the critical community size. The straw-coloured fruit bat, Eidolon helvum, has been identified as a reservoir for henipaviruses (serological evidence) and Lagos bat virus (LBV; virus isolation and serological evidence) in continental Africa. Here, we sampled from a remote population of E. helvum annobonensis fruit bats on Annobón island in the Gulf of Guinea to investigate whether antibodies to these viruses also exist in this isolated subspecies. Henipavirus serological analyses (Luminex multiplexed binding and inhibition assays, virus neutralisation tests and western blots) and lyssavirus serological analyses (LBV: modified Fluorescent Antibody Virus Neutralisation test, LBV and Mokola virus: lentivirus pseudovirus neutralisation assay) were undertaken on 73 and 70 samples respectively. Given the isolation of fruit bats on Annobón and their lack of connectivity with other populations, it was expected that the population size on the island would be too small to allow persistence of viruses that are thought to cause acute and immunising infections. However, the presence of antibodies against henipaviruses was detected using the Luminex binding assay and confirmed using alternative assays. Neutralising antibodies to LBV were detected in one bat using both assays. We demonstrate clear evidence for exposure of multiple individuals to henipaviruses in this remote population of E. helvum annobonensis fruit bats on Annobón island. The situation is less clear for LBV. Seroprevalences to henipaviruses and LBV in Annobón are notably different to those in E. helvum in continental locations studied using the same sampling techniques and assays. Whilst cross-sectional serological studies in wildlife populations cannot provide details on viral dynamics within populations, valuable information on the presence or absence of viruses may be obtained and utilised for informing future studies.
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Affiliation(s)
- Alison J Peel
- Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom.
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Broder CC, Geisbert TW, Xu K, Nikolov DB, Wang LF, Middleton D, Pallister J, Bossart KN. Immunization strategies against henipaviruses. Curr Top Microbiol Immunol 2012; 359:197-223. [PMID: 22481140 PMCID: PMC4465348 DOI: 10.1007/82_2012_213] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Hendra virus and Nipah virus are recently discovered and closely related emerging viruses that now comprise the genus henipavirus within the sub-family Paramyxoviridae and are distinguished by their broad species tropism and in addition to bats can infect and cause fatal disease in a wide variety of mammalian hosts including humans. The high mortality associated with human and animal henipavirus infections has highlighted the importance and necessity of developing effective immunization strategies. The development of suitable animal models of henipavirus infection and pathogenesis has been critical for testing the efficacy of potential therapeutic approaches. Several henipavirus challenge models have been used and recent successes in both active and passive immunization strategies against henipaviruses have been reported which have all targeted the viral envelope glycoproteins.
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Affiliation(s)
- Christopher C. Broder
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, MD 20814, USA
| | - Thomas W. Geisbert
- Galveston National Laboratory and Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, TX 77550, USA
| | - Kai Xu
- Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
| | - Dimitar B. Nikolov
- Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
| | - Lin-Fa Wang
- CSIRO Livestock Industries, Australian Animal Health Laboratory, 5 Portarlington Road, Geelong, VIC 3220, Australia
| | - Deborah Middleton
- CSIRO Livestock Industries, Australian Animal Health Laboratory, 5 Portarlington Road, Geelong, VIC 3220, Australia
| | - Jackie Pallister
- CSIRO Livestock Industries, Australian Animal Health Laboratory, 5 Portarlington Road, Geelong, VIC 3220, Australia
| | - Katharine N. Bossart
- Department of Microbiology, Boston University School of Medicine, Boston, MA 02118, USA. National Emerging Infectious Diseases Laboratories Institute, Boston University School of Medicine, Boston, MA 02118, USA
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Hayman DTS, Gurley ES, Pulliam JRC, Field HE. The application of one health approaches to henipavirus research. Curr Top Microbiol Immunol 2012; 365:155-70. [PMID: 23160861 DOI: 10.1007/82_2012_276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Henipaviruses cause fatal infection in humans and domestic animals. Transmission from fruit bats, the wildlife reservoirs of henipaviruses, is putatively driven (at least in part) by anthropogenic changes that alter host ecology. Human and domestic animal fatalities occur regularly in Asia and Australia, but recent findings suggest henipaviruses are present in bats across the Old World tropics. We review the application of the One Health approach to henipavirus research in three locations: Australia, Malaysia and Bangladesh. We propose that by recognising and addressing the complex interaction among human, domestic animal and wildlife systems, research within the One Health paradigm will be more successful in mitigating future human and domestic animal deaths from henipavirus infection than alternative single-discipline approaches.
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Affiliation(s)
- David T S Hayman
- Department of Biology, Colorado State University, Fort Collins, CO, 80523, USA,
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63
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Hayman DTS, Gurley ES, Pulliam JRC, Field HE. The Application of One Health Approaches to Henipavirus Research. Curr Top Microbiol Immunol 2012. [DOI: 10.1007/978-3-662-45792-4_276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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