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At least 19 recordsLinked to original sources
PubMed2025

Conserved Filovirus Proteins as Targets of Broad-Spectrum Antivirals.

Filoviruses are enveloped, non-segmented, negative-strand RNA viruses belonging to the Filoviridae family, which includes five genera: Ebolavirus, Marburgvirus, Cuevavirus, Striavirus, and Thamnovirus. Members of this family cause severe and, often, fatal hemorrhagic fevers in humans and non-human primates, with high mortality rates. To date, only two filoviruses, Ebola virus (EBOV) and Marburg virus (MARV), are known to infect humans and are listed as priority pathogens by the World Health Organization due to their potential for re-emergence and the current lack of effective vaccines and antiviral treatments. In this study, we identify and characterize conserved binding sites within key filoviral proteins to support the development of broad-spectrum, direct-acting antiviral agents. We validated the significance of these conserved regions for drug discovery using existing experimental data. Our analysis revealed notably high sequence similarity among proteins from filoviruses capable of infecting humans (EBOV, TAFV, BDBV, SUDV, MARV, and RAVV) compared to those from non-zoonotic species, with the highest conservation observed in the L and VP40 proteins-both critical for viral genome transcription and replication. Furthermore, we compiled and analyzed available experimental data on known antiviral compounds targeting these proteins, identifying several agents with cross-filovirus activity, including Galidesivir, Remdesivir, and Favipiravir. The integrated approach described here-combining sequence and structural conservation analysis with chemical structure and antiviral activity data-demonstrates a strategy that could be extended to the development of broad-spectrum therapeutics across multiple viral families.

Broad Spectrum Antiviral↗
PubMed1979

Ebola and Marburg viruses: I. Some ultrastructural differences between strains when grown in Vero cells.

A strain of Marburg virus and two strains of Ebola virus grown in Vero cells were compared by electron microscopy. The outer coat of the Marburg virion appeared to be more resistant to erosion by negative staining techniques than that of the Epbola strains. Marburg virus commonly produced "torus" forms and short filaments; the Zaire strain of Ebola produced extensive branched forms and very long filaments; the Sudan strain of Ebola produced shorter, less branched structures but very many aberrant forms. The mechanism for the production of these aberrant forms is described.

Animals↗
PubMed1979

Ebola and Marburg viruses: II. Thier development within Vero cells and the extra-cellular formation of branched and torus forms.

The development of Marburg virus and the Sudanese and Zaire strains of Ebola virus in Vero cells as visualized by electron microscopy is described. Despite differences in timing, all three strains appear to pass through identical stages of development. Initially there is a large increase in nucleolus material, and viral precursor material arranges itself in spirals and then into tubes. The cells fill with core material, which passes to the plasmalemma, which often proliferates. Each virion passes through the plasmalemma, acquiring a coat of host material. The formation of torus forms is discussed; the branched appearance that is often seen is believed to be an aberrant form. The reasons for this view are put forward.

Animals↗
PubMed2025

Transcription- and Replication-Competent Virus-like Particle Systems for Marburg Virus.

Here, we describe the transcription- and replication-competent virus-like particle (trVLP) system for Marburg virus (MARV), which recapitulates transcription and replication of the viral genome in addition to viral particle assembly, egress, and entry. This protocol includes instructions for transfections for producer and acceptor cells and the use of trVLPs for infection.

Marburgvirus↗
PubMed2025

Generation of Biologically Contained Marburg Virus.

Wild-type Marburg virus (MARV) can only be handled in biosafety level 4 facilities. By removing an essential gene from the virus genome, deficient virus particles can be generated that are only capable of replication if the missing gene product is provided in trans. As a result, these viruses are restricted to specific cell lines, making them safe to handle at lower biosafety levels. Here, we provide a detailed overview of how to generate MARV in which the VP30 gene has been replaced by a green fluorescent reporter gene, as well as how to use lentiviral transduction to create stable cell lines expressing MARV VP30. These cell lines can be used for the propagation and confinement of the resulting reporter virus.

Marburgvirus↗
PubMed2025

Droplet-Based Single-Cell 3' mRNA Sequencing of Marburg Virus-Infected Samples.

Single-cell technologies are continually evolving with emerging methods that are gradually uncovering the central DNA-RNA-protein dogma. Single-cell RNA sequencing is one arm of a multi-omic approach that achieves an astounding level of granularity to reveal the complexity of virus-host interactions at the transcriptomic level. Cell tropism, virus replication, pathogenesis, and gene expression changes mediated by the virus and the host's immune response to infection are just some areas of study that are gaining better clarity due to the high-resolution analysis afforded by the technology.We describe a single-cell sequencing protocol for Marburg virus infection in vivo using nonhuman primate blood and the 10× Chromium Next GEM single-cell genomics methodology. Working with pathogens of high consequence is logistically complicated, requiring containment in biosafety level (BSL)-4 laboratories and harsh inactivation procedures before samples can safely be removed to lower biosafety conditions. We provide procedural insight into sample isolation and processing conducted in BSL-4 and describe the requirements for safe sample removal without jeopardizing quality for down-stream sequencing and analysis in BSL-2 conditions. Characterization of complicated biological processes mediated by high-containment pathogens, typically restricted to analogous model systems, e.g., minigenome, can be achieved using live virus.

Animals↗
PubMed2025

Marburg Virus Minigenome Assays.

This chapter describes minigenome systems for Marburg virus (MARV), which reconstitute the viral polymerase complex functions of gene expression and genome replication. Procedures covered herein include passage and seeding of cells, transfection, sample collection, and reporter gene assays.

Marburgvirus↗
PubMed1977

[Maridi haemorrhgic fever: a new viral disease (author's transl)].

A new viral disease (Maridi haemorrhagic fever) occurred in the South Sudan in 1976. It was obviously identical with an epidemic which occurred at the same time in Zaire. The virus is morpologically closely similar to the Marburg virus. During the Maridi epemic 124 of 238 patients died (52%). Characteristic symptoms were fever and headache (100%), diarrhoea (83%), retrosternal pain (82%), vomiting (68%), haemorrhages (62%), morbilliform or vesicular rash (52%). At post-mortem there were changes in liver, kidney, myocardium and lungs, similar to those in the Marburg virus disease, as were those observed in bone marrow and peripheral blood. Despite these analagous findings, the clinical course and results of immunofluorescence indicate that it is a new disease. The epidemic ended after suitable isolation measures had been taken. There was no specific treatment but in some cases convalescent plasma and interferon were tried. The disease is transmitted among humans by direct contact or by contact with blood or excreta of patients. No animal reservoir has been found. It is possible for this disease to be imported also into countries with a modorate climate.

Adolescent↗
PubMed2026

Re-emerging Marburg virus disease in Africa: spillover ecology, geographic expansion, and surveillance vulnerabilities.

Marburg virus disease (MVD) is re-emerging across Africa as a high-consequence zoonosis shaped by expanding ecological suitability, repeated spillover, and uneven surveillance capacity. This review synthesizes current evidence on the ecological, epidemiological, and operational determinants of contemporary Marburg virus (MARV) emergence. We conceptualize MVD as an ecological-emergence system produced by interactions among reservoir-host biology, environmental change, human exposure, health-system readiness, and mobility, rather than as a series of isolated outbreaks. Recent detections in multiple African regions indicate wider enzootic circulation than previously recognized and support repeated, reservoir-associated introductions from distributed ecological foci. Spillover risk is heightened where mining, land-use change, agricultural encroachment, settlement growth, climate-sensitive habitat disruption, and population movement increase contact with Egyptian rousette bats (Rousettus aegyptiacus) and contaminated roost environments. Following primary spillover, diagnostic delays, fragmented surveillance, limited laboratory decentralization, healthcare-associated transmission, and mobility-linked exposure can enable outbreak amplification and delayed recognition. Serological findings further suggest possible "shadow epidemiology," with unrecognized or mild MARV infections occurring outside confirmed outbreak chains. Critical preparedness gaps persist in ecological risk mapping, longitudinal reservoir surveillance, decentralized molecular diagnostics, genomic sequencing, data integration, and cross-border early warning. Future preparedness should move beyond reactive containment toward integrated One Health approach combining predictive ecological surveillance, rapid community-level detection, real-time genomics, infection prevention, risk communication, and regional coordination to identify spillover early and prevent human transmission.

Animals↗
PubMed1978

Ultrastructure of Ebola virus particles in human liver.

Electron microscopy of tissues from two necropsies carried out in the Sudan on patients with Ebola virus infection identified virus particles in lung and spleen, but the main concentrations of Ebola particles were seen in liver sections. Viral precursor proteins and cores were found in functional liver cells, often aligned in membrane-bound aggregations. Complete virions, usually found only extracellularly, were mainly seen as long tubular forms, some without cores. Many tubular forms had 'enlarged heads' or 'spores' and some branched and torus forms were identified. The size and structure of the Ebola virus forms appear to be virtually indistinguishable from those of Marburg virus.

Female↗
PubMed1975

Biohazards and simian viruses.

Nonhuman primates are extensively used in laboratories as experimental animals. It is necessary, however, to realize that their employment may be dangerous to man and other species of primates, if recognition of their flora and fauna, especially viral, is not considered and if appropriate controls are not followed. Several outbreaks have occurred, resulting in high mortality and morbidity of man and simian. A number of recommendations are provided which, if followed, will minimize the waste of time, money, and life.

Animals↗