scholarly journals Ecological dynamics of emerging bat virus spillover

2015 ◽  
Vol 282 (1798) ◽  
pp. 20142124 ◽  
Author(s):  
Raina K. Plowright ◽  
Peggy Eby ◽  
Peter J. Hudson ◽  
Ina L. Smith ◽  
David Westcott ◽  
...  
Keyword(s):  
Land Use ◽  
Ebola Virus ◽  
Land Use Changes ◽  
Nipah Virus ◽  
Reservoir Host ◽  
Hendra Virus ◽  
Marburg Virus ◽  
Virus Shedding ◽  
Viral Shedding ◽  
Reservoir Hosts

Viruses that originate in bats may be the most notorious emerging zoonoses that spill over from wildlife into domestic animals and humans. Understanding how these infections filter through ecological systems to cause disease in humans is of profound importance to public health. Transmission of viruses from bats to humans requires a hierarchy of enabling conditions that connect the distribution of reservoir hosts, viral infection within these hosts, and exposure and susceptibility of recipient hosts. For many emerging bat viruses, spillover also requires viral shedding from bats, and survival of the virus in the environment. Focusing on Hendra virus, but also addressing Nipah virus, Ebola virus, Marburg virus and coronaviruses, we delineate this cross-species spillover dynamic from the within-host processes that drive virus excretion to land-use changes that increase interaction among species. We describe how land-use changes may affect co-occurrence and contact between bats and recipient hosts. Two hypotheses may explain temporal and spatial pulses of virus shedding in bat populations: episodic shedding from persistently infected bats or transient epidemics that occur as virus is transmitted among bat populations. Management of livestock also may affect the probability of exposure and disease. Interventions to decrease the probability of virus spillover can be implemented at multiple levels from targeting the reservoir host to managing recipient host exposure and susceptibility.

scholarly journals Bat-associated diseases

2017 ◽  
Vol 38 (1) ◽  
pp. 3
Author(s):  
Glenn A Marsh
Keyword(s):  
Infectious Diseases ◽  
Rabies Virus ◽  
Ebola Virus ◽  
Animal Health ◽  
Nipah Virus ◽  
Emerging Infectious Diseases ◽  
Hendra Virus ◽  
Marburg Virus ◽  
Associated Diseases ◽  
Zoonotic Viruses

Emerging infectious diseases pose a significant threat to human and animal health. Increasingly, emerging and re-emerging infectious diseases are of zoonotic origin and are derived from wildlife. Bats have been identified as an important reservoir of zoonotic viruses belonging to a range of different virus families including SARSCoronavirus, Rabies virus, Hendra virus, Nipah virus, Marburg virus and Ebola virus.

scholarly journals Brief review on remdesivir

2021 ◽  
pp. 57
Author(s):  
Venkata Niharika Daka ◽  
Lakshmi Sravanthi Bandi ◽  
Sushma Alla ◽  
Venkata Spandana Cheedella ◽  
Sadasiva Rao Galaba
Keyword(s):  
Ebola Virus ◽  
Nipah Virus ◽  
Antiviral Drug ◽  
Hendra Virus ◽  
Marburg Virus ◽  
Nucleoside Triphosphate ◽  
Syncytial Virus ◽  
Respiratory Epithelial

Remdesivir is an investigational broad-spectrum small-molecule antiviral drug that has confirmed interest in the direction of RNA viruses in numerous families, which encompass Coronaviridae (alongside aspect SARS-CoV, MERS-CoV, and lines of bat coronaviruses able to infecting human respiratory epithelial cells), Paramyxoviridae (alongside aspect Nipah virus, respiratory syncytial virus, and Hendra virus), and Filoviridae (alongside aspect Ebola virus). Originally superior to cope with Ebola virus infection , remdesivir is a prodrug of the determine adenosine analog, each of which can be metabolized into an energetic nucleoside triphosphate (NTP) via the host. The determine nucleoside, GS-441524, has displayed antiviral interest within the direction of SARS-CoV, Marburg virus , and pussycat infectious peritonitis virus, amongst others. A fashion of research have tested the effects of these pills on coronaviruses (CoVs) each in vitro and in vivo the use of mouse and non-human primate animal models.

scholarly journals Establishment of Intestinal Organoid from Rousettus leschenaultii and the Susceptibility to Bat-Associated Viruses, SARS-CoV-2 and Pteropine Orthoreovirus

2021 ◽  
Vol 22 (19) ◽  
pp. 10763
Author(s):  
Mohamed Elbadawy ◽  
Yuki Kato ◽  
Nagisa Saito ◽  
Kimika Hayashi ◽  
Amira Abugomaa ◽  
...  
Keyword(s):  
Ebola Virus ◽  
Nipah Virus ◽  
Hendra Virus ◽  
Marburg Virus ◽  
Intestinal Epithelial ◽  
Tolerance Mechanisms ◽  
Experimental Inoculation ◽  
Natural Hosts ◽  
Epithelial Structure

Various pathogens, such as Ebola virus, Marburg virus, Nipah virus, Hendra virus, Severe Acute Respiratory Syndrome Coronavirus (SARS-CoV), Middle East Respiratory Syndrome Coronavirus (MERS-CoV), and SARS-CoV-2, are threatening human health worldwide. The natural hosts of these pathogens are thought to be bats. The rousette bat, a megabat, is thought to be a natural reservoir of filoviruses, including Ebola and Marburg viruses. Additionally, the rousette bat showed a transient infection in the experimental inoculation of SARS-CoV-2. In the current study, we established and characterized intestinal organoids from Leschenault’s rousette, Rousettus leschenaultii. The established organoids successfully recapitulated the characteristics of intestinal epithelial structure and morphology, and the appropriate supplements necessary for long-term stable culture were identified. The organoid showed susceptibility to Pteropine orthoreovirus (PRV) but not to SARS-CoV-2 in experimental inoculation. This is the first report of the establishment of an expandable organoid culture system of the rousette bat intestinal organoid and its sensitivity to bat-associated viruses, PRV and SARS-CoV-2. This organoid is a useful tool for the elucidation of tolerance mechanisms of the emerging rousette bat-associated viruses such as Ebola and Marburg virus.

scholarly journals Evolution of Nipah Virus Infection: Past, Present, and Future Considerations

2021 ◽  
Vol 6 (1) ◽  
pp. 24
Author(s):  
Naomi Hauser ◽  
Alexis C. Gushiken ◽  
Shivakumar Narayanan ◽  
Shyam Kottilil ◽  
Joel V. Chua
Keyword(s):  
Case Fatality Rate ◽  
Nipah Virus ◽  
Case Fatality ◽  
Therapeutic Agents ◽  
Reservoir Host ◽  
Fruit Bats ◽  
Intermediate Hosts ◽  
Mode Of Transmission ◽  
Human Infections ◽  
Reservoir Hosts

Nipah virus (NiV) is a zoonotic paramyxovirus of the Henipavirus genus first identified in Malaysia in 1998. Henipaviruses have bat reservoir hosts and have been isolated from fruit bats found across Oceania, Asia, and Africa. Bat-to-human transmission is thought to be the primary mode of human NiV infection, although multiple intermediate hosts are described. Human infections with NiV were originally described as a syndrome of fever and rapid neurological decline following contact with swine. More recent outbreaks describe a syndrome with prominent respiratory symptoms and human-to-human transmission. Nearly annual outbreaks have been described since 1998 with case fatality rates reaching greater than 90%. The ubiquitous nature of the reservoir host, increasing deforestation, multiple mode of transmission, high case fatality rate, and lack of effective therapy or vaccines make NiV’s pandemic potential increasingly significant. Here we review the epidemiology and microbiology of NiV as well as the therapeutic agents and vaccines in development.

Bat and virus ecology in a dynamic world

2017 ◽  
Vol 38 (1) ◽  
pp. 33
Author(s):  
David A Wilkinson ◽  
David TS Hayman
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Nipah Virus ◽  
Hendra Virus ◽  
Marburg Virus ◽  
Human Populations ◽  
Anthropogenic Changes ◽  
Virus Ecology ◽  
Bat Virus ◽  
The World ◽  
Australian Bat Lyssavirus

The emergence of infectious diseases caused by bat-associated viruses has had a devastating and wide-reaching effect on human populations. These viruses include lyssaviruses such as rabies virus, the filoviruses, Ebola (EBOV) and Marburg virus, Severe Acute Respiratory Syndrome (SARS) coronavirus, and the paramyxoviruses, Hendra virus (HeV) and Nipah virus (NiV)1. As a result bats have been the focus of substantial research (Fig. 1) and certain cellular and physiological traits of bats are hypothesised to lead to ‘special’ bat-virus associations2,3 (but see Han et al.4). The anthropogenic changes in the world we live will influence human health5, including through their impact on bat ecology and the viruses within bat populations. Australian people and livestock have been infected by novel bat viruses, such as HeV, Menangle viruses (MenV) and Australian bat lyssavirus (ABLV), and are at the forefront of both epidemiological and virological research efforts into cross-species transmission events (spillover): here we put some of those efforts and the potential impacts of anthropogenic changes on bat-virus ecology under the microscope.

scholarly journals Offering patients more: how the West Africa Ebola outbreak can shape innovation in therapeutic research for emerging and epidemic infections

2017 ◽  
Vol 372 (1721) ◽  
pp. 20160294 ◽  
Author(s):  
Amanda M. Rojek ◽  
Peter W. Horby
Keyword(s):  
West Africa ◽  
Ebola Virus ◽  
Virus Disease ◽  
Nipah Virus ◽  
Emerging Infectious Diseases ◽  
Disease Outbreaks ◽  
International Travel ◽  
Marburg Virus ◽  
World Health ◽  
The West

Although, after an epidemic of over 28 000 cases, there are still no licensed treatments for Ebola virus disease (EVD), significant progress was made during the West Africa outbreak. The pace of pre-clinical development was exceptional and a number of therapeutic clinical trials were conducted in the face of considerable challenges. Given the on-going risk of emerging infectious disease outbreaks in an era of unprecedented population density, international travel and human impact on the environment it is pertinent to focus on improving the research and development landscape for treatments of emerging and epidemic-prone infections. This is especially the case since there are no licensed therapeutics for some of the diseases considered by the World Health Organization as most likely to cause severe outbreaks—including Middle East respiratory syndrome coronavirus, Marburg virus, Crimean Congo haemorrhagic fever and Nipah virus. EVD, therefore, provides a timely exemplar to discuss the barriers, enablers and incentives needed to find effective treatments in advance of health emergencies caused by emerging infectious diseases. This article is part of the themed issue ‘The 2013–2016 West African Ebola epidemic: data, decision-making and disease control’.

scholarly journals Crystal Structure and Carbohydrate Analysis of Nipah Virus Attachment Glycoprotein: a Template for Antiviral and Vaccine Design

2008 ◽  
Vol 82 (23) ◽  
pp. 11628-11636 ◽  
Author(s):  
Thomas A. Bowden ◽  
Max Crispin ◽  
David J. Harvey ◽  
A. Radu Aricescu ◽  
Jonathan M. Grimes ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Ebola Virus ◽  
Nipah Virus ◽  
Glycosylation Site ◽  
Hendra Virus ◽  
Molecular Surface ◽  
Spectrometric Analysis ◽  
Viral Attachment ◽  
Virus Attachment ◽  
Host Interaction

ABSTRACT Two members of the paramyxovirus family, Nipah virus (NiV) and Hendra virus (HeV), are recent additions to a growing number of agents of emergent diseases which use bats as a natural host. Identification of ephrin-B2 and ephrin-B3 as cellular receptors for these viruses has enabled the development of immunotherapeutic reagents which prevent virus attachment and subsequent fusion. Here we present the structural analysis of the protein and carbohydrate components of the unbound viral attachment glycoprotein of NiV glycoprotein (NiV-G) at a 2.2-Å resolution. Comparison with its ephrin-B2-bound form reveals that conformational changes within the envelope glycoprotein are required to achieve viral attachment. Structural differences are particularly pronounced in the 579-590 loop, a major component of the ephrin binding surface. In addition, the 236-245 loop is rather disordered in the unbound structure. We extend our structural characterization of NiV-G with mass spectrometric analysis of the carbohydrate moieties. We demonstrate that NiV-G is largely devoid of the oligomannose-type glycans that in viruses such as human immunodeficiency virus type 1 and Ebola virus influence viral tropism and the host immune response. Nevertheless, we find putative ligands for the endothelial cell lectin, LSECtin. Finally, by mapping structural conservation and glycosylation site positions from other members of the paramyxovirus family, we suggest the molecular surface involved in oligomerization. These results suggest possible pathways of virus-host interaction and strategies for the optimization of recombinant vaccines.

scholarly journals REVIEW: REMDESIVIR AS A CANDIDATE FOR COVID-19 TREATMENT

2021 ◽  
Vol 6 (8) ◽  
pp. 161-172
Author(s):  
Iffah Anasia ◽  
Zulharmita Zulharmita ◽  
Ridho Asra
Keyword(s):  
Respiratory System ◽  
Ebola Virus ◽  
Nipah Virus ◽  
Antiviral Drug ◽  
Antiviral Agent ◽  
Hendra Virus ◽  
Direct Acting Antiviral ◽  
The Us ◽  
Syncytial Virus ◽  
Direct Acting

Remdesivir is the first drug that has been approved by the US Food and Drug Administration (FDA) for clinical use in hospitalized patients with COVID-19 disease. From several therapeutic options, Remdesivir is a direct-acting antiviral drug that has previously been tested against the Ebola virus, known to be effective and safe enough to inhibit the replication of SARS-CoV-2. Corona virus or severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is a virus that attacks the respiratory system in humans, this virus can cause mild disorders of the respiratory system, severe lung infections, and even death. Remdesivir is a broad-spectrum antiviral agent that has previously shown antiviral activity against filoviruses (Ebola and Marburg viruses), coronaviruses (SARS-CoV, MERS-CoV, SARS CoV-2), paramyxoviruses (type III influenza virus, Nipah virus, Hendra virus, measles, and mumps virus) and Pnemoviriidae (respiratory syncytial virus).

scholarly journals Zoonotic potential of a novel bat morbillivirus

2021 ◽  
Author(s):  
Benhur Lee ◽  
Satoshi Ikegame ◽  
Jillian Carmichael ◽  
Heather Wells ◽  
Robert Furler ◽  
...  
Keyword(s):  
Measles Virus ◽  
Reverse Genetics ◽  
Ebola Virus ◽  
Severe Disease ◽  
Nipah Virus ◽  
Lymphoid Cells ◽  
Specific Expression ◽  
Species Specific ◽  
Reservoir Hosts ◽  
Viral Sequences

Abstract Bats are significant reservoir hosts for many viruses with zoonotic potential1. SARS-CoV-2, Ebola virus, and Nipah virus are examples of such viruses that have caused deadly epidemics and pandemics when spilled over from bats into human and animal populations2,3. Careful surveillance of viruses in bats is critical for identifying potential zoonotic pathogens. However, metagenomic surveys in bats often do not result in full-length viral sequences that can be used to regenerate such viruses for targeted characterization4. Here, we identify and characterize a novel morbillivirus from a vespertilionid bat species (Myotis riparius) in Brazil, which we term myotis bat morbillivirus (MBaMV). There are 7 species of morbilliviruses including measles virus (MeV), canine distemper virus (CDV) and rinderpest virus (RPV)5. All morbilliviruses cause severe disease in their natural hosts6–10, and pathogenicity is largely determined by species specific expression of canonical morbillivirus receptors, CD150/SLAMF111 and NECTIN412. MBaMV used Myotis spp CD150 much better than human and dog CD150 in fusion assays. We confirmed this using live MBaMV that was rescued by reverse genetics. Surprisingly, MBaMV replicated efficiently in primary human myeloid but not lymphoid cells. Furthermore, MBaMV replicated in human epithelial cells and used human NECTIN4 almost as well as MeV. Our results demonstrate the unusual ability of MBaMV to infect and replicate in some human cells that are critical for MeV pathogenesis and transmission. This raises the specter of zoonotic transmission of a bat morbillivirus.

scholarly journals Ecological conditions experienced by bat reservoir hosts predict the intensity of Hendra virus excretion over space and time

2021 ◽  
Author(s):  
Daniel J. Becker ◽  
Peggy Eby ◽  
Wyatt Madden ◽  
Alison J. Peel ◽  
Raina K. Plowright
Keyword(s):  
Hendra Virus ◽  
Virus Shedding ◽  
Ecological Conditions ◽  
Space And Time ◽  
Virus Excretion ◽  
Food Shortages ◽  
Generalized Additive Mixed Models ◽  
Additive Mixed Models ◽  
Reservoir Hosts

AbstractThe ecological conditions experienced by wildlife reservoir hosts affect the amount of pathogen they excrete into the environment. This then shapes pathogen pressure, the amount of pathogen available to recipient hosts over space and time, which affects spillover risk. Few systems have data on both long-term ecological conditions and pathogen pressure, yet such data are critical for advancing our mechanistic understanding of ecological drivers of spillover risk. To identify these ecological drivers, we here reanalyze shedding data from a spatially replicated, multi-year study of Hendra virus excretion from Australian flying foxes in light of 25 years of long-term data on changing ecology of the bat reservoir hosts. Using generalized additive mixed models, we show that winter virus shedding pulses, previously considered idiosyncratic, are most pronounced after recent food shortages and in bat populations that have been displaced to novel habitats. We next derive the area under each annual shedding curve (representing cumulative virus excretion) and show that pathogen pressure is also affected by the ecological conditions experienced by bat populations. Finally, we illustrate that pathogen pressure positively predicts observed spillover frequency. Our study suggests that recent ecological conditions of flying fox hosts are shifting the timing, magnitude, and cumulative intensity of Hendra virus shedding in ways that shape the landscape of spillover risk. This work provides a mechanistic approach to understanding and estimating risk of spillover from reservoir hosts in complex ecological systems and emphasizes the importance of host ecological context in identifying the determinants of pathogen shedding.

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