Publications by authors named "Dacheux L"

Among lyssaviruses, West Caucasian bat virus (WCBV) and Lleida bat lyssavirus (LLEBV) raise concern as their divergence from rabies virus leads to the inefficacy of available prophylactic agents. Both viruses were described in the bat . We investigated the European distribution of WCBV and LLEBV by screening sera from across eight countries, finding widespread serological evidence and positivity up to 70%.

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Rabies is one of the oldest known zoonotic diseases, with dogs being the main reservoir for 99% of the cases of human rabies. However, wild animals may also be rabies vectors. In most cases, contact with a rabid animal results in rabies without pre- or post-exposure prophylaxis, and the disease is nearly always fatal.

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  • Researchers sequenced the complete genome of a rabies virus from a gold panner's cerebellum who died from unknown encephalitis in French Guiana.
  • The analysis revealed that this virus is closely related to rabies strains found in vampire bats.
  • This finding marks the second recorded case of human rabies in that region.
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In recent decades, bats have been associated with numerous viral pandemics. Bats harbor a large variety of viruses, some of which have a high zoonotic potential for humans. While infection with these viruses can be fatal in other mammals, bats are often infected asymptomatically.

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The attainment of the global target of zero dog-mediated human rabies by 2030 depends on functional rabies programmes. Nigeria, a rabies-endemic country, and the most populous country in Africa has a very poor rabies control strategy with a score of 1.5 out of 5 based on the Stepwise Approach towards Rabies Elimination (SARE).

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In epidemiology, endemicity characterizes sustained pathogen circulation in a geographical area, which involves a circulation that is not being maintained by external introductions. Because it could potentially shape the design of public health interventions, there is an interest in fully uncovering the endemic pattern of a disease. Here, we use a phylogeographic approach to investigate the endemic signature of rabies virus (RABV) circulation in Cambodia.

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Background: Coevolution between pathogens and their hosts decreases host morbidity and mortality. Bats host and can tolerate viruses which can be lethal to other vertebrate orders, including humans. Bat adaptations to infection include localized immune response, early pathogen sensing, high interferon expression without pathogen stimulation, and regulated inflammatory response.

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  • * It was expanded to include two new families, 41 new genera, and 98 new species, along with reclassifications for 349 species.
  • * The article details the updated taxonomy of Negarnaviricota, including corrections of misspelled names for seven species.
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  • * In this study, researchers found that various bat cell lines did not allow SARS-CoV-2 to infect, even when they expressed ACE2, the receptor used by the virus; infection was only possible when human ACE2 was introduced.
  • * The findings suggest that bats possess specific molecular barriers to viral replication, highlighting the importance of developing bat cellular models to better understand the evolutionary relationship between bats and coronaviruses.
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The is a large family of negative-sense (-) RNA viruses that includes important pathogens of ray-finned fish and marine mammals. As for all viruses, the taxonomic assignment of rhabdoviruses occurs through a process implemented by the International Committee on Taxonomy of Viruses (ICTV). A recent revision of taxonomy conducted in conjunction with the ICTV Study Group has resulted in the establishment of three new subfamilies (, , and ) within the , as well as three new genera (, , and ) and seven new species for viruses infecting fish or marine mammals.

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As in other African countries, canine rabies is endemic in Liberia. However, data concerning the genetic diversity of rabies virus isolates circulating in this country remain limited. We report here the complete genome sequences of five rabies viruses obtained from domestic animals.

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In this report, we describe eight nearly complete genome sequences of rabies virus strains collected in the Democratic Republic of the Congo from domestic carnivores in 2017 and 2018. All of them clustered into a specific phylogroup among the Africa 1b lineage in the Cosmopolitan clade.

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  • * It reports on the characterization of seven previously unclassified rhabdoviruses from birds in Africa, revealing their genomic structure contains five canonical rhabdovirus genes and additional proteins of unknown function.
  • * The findings suggest these rhabdoviruses could be new species within a specific genus, highlighting their connection to insect-related viruses and raising concerns about their potential effects on bird populations as arboviruses.
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Rabies virus (RABV), the causative agent for rabies disease is still presenting a major public health concern causing approximately 60,000 deaths annually. This neurotropic virus (genus , family ) induces an acute and almost always fatal form of encephalomyelitis in humans. Despite the lethal consequences associated with clinical symptoms of rabies, RABV limits neuro-inflammation without causing major histopathological lesions in humans.

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A perhabdovirus was isolated from a mortality episode affecting a fish farm in 2019 in Western Europe. This virus was produced in cell culture and was readily detected by a species-specific real-time PCR assay. The near-complete sequence of the virus obtained showed some relatedness with viruses of the species .

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  • * Next generation sequencing (NGS) successfully identified European bat lyssavirus type 1a in the patient's brain tissue, confirming the cause of death, despite the diagnosis not suggesting rabies.
  • * The findings highlight the importance of NGS in detecting rare viruses and suggest that individuals in close contact with bats should consider rabies vaccinations, which are effective against EBLV-1.
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  • Pre-exposure rabies prophylaxis (PrEP) is essential for those at high risk of exposure to rabies virus, protecting against unrecognized infections.
  • A study of 498 vaccinated individuals revealed that 17.2% showed inadequate immune response after the initial vaccination, while only 0.5% had an inadequate response after receiving a booster dose.
  • The findings suggest that a single booster significantly enhances long-term immunity, potentially simplifying the need for regular antibody monitoring among those at professional risk.
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Bats, the second largest order of mammals worldwide, harbor specific characteristics such as sustaining flight, a special immune system, unique habits, and ecological niches. In addition, they are the natural reservoirs of a variety of emerging or re-emerging zoonotic pathogens. is one of the most diverse families of RNA viruses, which consists of 20 ecologically diverse genera, infecting plants, mammals, birds, reptiles, and fish.

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Despite declaration as a national priority disease, dog rabies remains endemic in Liberia, with surveillance systems and disease control activities still developing. The objective of these initial efforts was to establish animal rabies diagnostics, foster collaboration between all rabies control stakeholders, and develop a short-term action plan with estimated costs for rabies control and elimination in Liberia. Four rabies diagnostic tests, the direct fluorescent antibody (DFA) test, the direct immunohistochemical test (dRIT), the reverse transcriptase polymerase chain reaction (RT-PCR) assay and the rapid immunochromatographic diagnostic test (RIDT), were implemented at the Central Veterinary Laboratory (CVL) in Monrovia between July 2017 and February 2018.

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Since the elimination of dog and terrestrial wild animal rabies, bat exposures remain the only source of autochthonous lyssavirus transmission to humans in Western Europe. European bats have already been found infected with several lyssaviruses, and human-bat interactions represent a risk of viral transmission and fatal encephalitis for humans. In this study, we aim to better characterize exposures to bats in metropolitan France from 2003 to 2016 and to identify circumstances associated with exposures to lyssavirus-positive bats.

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Functional rabies surveillance systems are crucial to provide reliable data and increase the political commitment necessary for disease control. To date, animals suspected as rabies-positive must be submitted to a postmortem confirmation using classical or molecular laboratory methods. However, most endemic areas are in low- and middle-income countries where animal rabies diagnosis is restricted to central veterinary laboratories.

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Background: This study sought to determine the proportion of individuals with non-HIV secondary immunodeficiencies presenting inadequate antibody titers after rabies post-exposure prophylaxis (PEP) and to identify variables associated with inadequate response.

Methods: A retrospective review of the records of immunocompromised patients having received a full course of PEP after a rabies exposure and having been tested for post-PPE antibody titers in two French Antirabies Clinics, between 2013 and 2018, was conducted. Antibody titers < 0.

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Perhabdoviruses are a threat to some freshwater fish species raised in aquaculture farms in Europe. Although the genetic diversity of these viruses is suspected to be high, the classification of isolates is still in its infancy, with just one full-length genome available and only partial sequences for a limited number of others. Here, we characterized a series of viruses isolated from percids in France from 1999 to 2009 by sequencing the nucleoprotein (N) gene.

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  • From 2013 to 2019, a study updated the incidence of rabies in international travelers, identifying 23 new cases that occurred after crossing borders or following migration.
  • Most cases involved male adult travelers, primarily in Europe and the Middle East, with exposure predominantly in Asia and Africa, especially among migrants from rabies-endemic areas.
  • A significant number (74%) of the individuals did not receive rabies post-exposure prophylaxis before displaying symptoms, emphasizing the need for better prevention information for travelers heading to rabies-prone regions.
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