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Development of a TaqMan Array Card for Acute-Febrile-Illness Outbreak Investigation and Surveillance of Emerging Pathogens, Including Ebola Virus.

Acute febrile illness (AFI) is associated with substantial morbidity and mortality worldwide, yet an etiologic agent is often not identified … an virus, hantaviruses [Hantaan and Seoul], hepatitis E, Marburg, Nipah virus, o'nyong-nyong virus, Rift Valley fever virus, West Nile virus, and yellow fever virus), 8 bacteria (Bartonella spp., Brucella spp., Coxiella burnetii, Leptospira spp., Rickettsia spp., Salmonella enterica and Salmonella enterica serovar Typhi, and Yersinia pestis), and 3 protozoa (Leishm …

Host range, amplification and arboviral disease emergence.

Etiologic agents of arboviral diseases are primarily zoonotic pathogens that are maintained in nature in cycles involving arthropod transmis … ctors with more catholic feeding preferences that include humans (e.g. EEEV). Some viruses, such as Rift Valley fever, Japanese encephalitis and Venezuelan equine encephalitis viruses (VEEV) undergo secondary amplification involving replication in livestock animals, resulting in greater levels of spillover to humans in rural settings. In the case of VEEV, secondary …

Antiviral and immunomodulating inhibitors of experimentally-induced Punta Toro virus infections.

A major component of a US Army Medical Research and Development Command-supported program to discover and develop new drugs for the treatment of Rift Valley fever, sandfly fever, and Crimean-Congo hemorrhagic fever has been to study candidate test materials against hepatotropic infections of C57BL/6 mice induced by the related but less biohazardous Punta Toro virus (PTV). The effects of 75 compounds, some of which were considered immunomodulators in their primary mechanism of activity, were studied in the PTV infection model. Of these, ribavirin, ribamidine, ribavirin 2',3',5'-triacetate, tiaz…

Broad-spectrum antiviral activity of 2-beta-D-ribofuranosylselenazole-4-carboxamide, a new antiviral agent.

The relative in vitro antiviral activities of three related nucleoside carboxamides, ribavirin (1-beta-D-ribofuranosyl-1,2,4-triazole-3-carb … lan equine encephalomyelitis virus, yellow fever virus, Japanese encephalitis virus), Bunyaviridae (Rift Valley fever virus, sandfly fever virus [strain Sicilian], Korean hemorrhagic fever virus), Arenaviridae (Pichinde virus), Picornaviridae (coxsackieviruses B1 and B4, echovirus type 6, encephalomyocarditis virus), Adenoviridae (adenovirus type 2), and Rhabdoviri …

The V1016G mutation of the voltage-gated sodium channel (VGSC) gene contributes to the insecticide resistance of Aedes aegypti from Makassar, Indonesia.

Aedes aegypti represents one of the main vectors of at least five relevant arthropod-borne viral infections in humans (i.e., Rift Valley fever, Dengue fever, Zika, chikungunya, and yellow fever) worldwide. Ae. aegypti control strategies are mostly based on using chemical insecticides (i.e., organophosphates, pyrethroids, carbamates, and organochlorines) and reducing larval sources. Furthermore, monitoring the growth activity and mapping the geographical distribution of insecticide resistance are mandatory, as recommended by the WHO. Accordingly, we conducted a study on the possible mechanism b…

Site-directed tyrosinase conjugation on engineered ferritin retains immune recognition.

Ferritin (Ft) nanoparticles are promising scaffolds for antigen display in vaccine design due to their stability, defined architecture, and … by Ellman's assay. Using tyrosinase-mediated catalysis, we conjugated two tyrosine-tagged antigens, Rift Valley fever virus Gn and SARS-CoV-2 receptor-binding domain, to the engineered cysteines. Up to 13 antigens were displayed per 24-mer nanoparticle. Conjugation was highly specific to the engineered cysteines, and the resulting antigen-PfFt conjugates bound neut …

A Review of Emerging Viral Pathogens and Current Concerns for Vertical Transmission of Infection.

Vertical transmission, or mother-to-child transmission, of bacterial, viral, or parasitic infection is rare due to the success of the barrie … including Ebola virus, Zika virus, and emerging arbovirus infections, including West Nile virus and Rift Valley fever virus. Although SARS-CoV-2 has rarely been reported to show transplacental spread, the recent COVID-19 pandemic has highlighted the importance of surveillance of new human pathogens with rapidly evolving transmission patterns. This article reviews t …

Identification of Three Novel Genes in Phenuiviridae Detected from Aedes Mosquitoes in Hokkaido, Japan.

Mosquitoes are important arthropod vectors of arboviruses. The family Phenuiviridae includes several medically important arboviruses, such as the Rift Valley fever phlebovirus and Toscana phlebovirus. Recent comprehensive genetic analyses have identified many novel mosquito-specific viruses that are phylogenetically related to Phenuiviridae. We collected mosquitoes from Hokkaido in northern Japan, and conducted reverse transcription polymerase chain reactions (RT-PCRs) targeting the RNA-dependent RNA polymerase (RdRp) gene of Phenuiviridae. A total of 285 pools, comprising 3,082 mosquitoes fro…

Variable Cognition in ABM Decision-Making: An Application to Livestock Vaccine Choice.

Modeling realistic human decision-making is an important feature of good policy design processes. The use of an agent-based modeling framewo … rationality that affect herdsmen decision-making to vaccinate cattle using a once-for-life vaccine (Rift Valley fever) and an annual booster vaccine (Contagious Bovine Pleuropneumonia). The simulation model uses environmental data from Samburu county, Kenya from 2004 to 2015. The cognitive parameters of memory and "rationality" are shown to successfully differentia …

Effects of Arbovirus Multi-Host Life Cycles on Dinucleotide and Codon Usage Patterns.

Arthropod-borne viruses (arboviruses) of vertebrates including dengue, zika, chikungunya, Rift Valley fever, and blue tongue viruses cause extensive morbidity and mortality in humans, agricultural animals, and wildlife across the globe. As obligate intercellular pathogens, arboviruses must be well adapted to the cellular and molecular environment of both their arthropod (invertebrate) and vertebrate hosts, which are vastly different due to hundreds of millions of years of separate evolution. Here we discuss the comparative pressures on arbovirus RNA genomes as a result of a dual host life cycl…

The antiviral potential of interferon-induced cotton rat Mx proteins against orthomyxovirus (influenza), rhabdovirus, and bunyavirus.

Influenza A virus (FLUAV) is an important human pathogen able to cause devastating pandemics. Recently, cotton rats have been proposed as an … on rat Mx1, was able to inhibit the rhabdovirus vesicular stomatitis virus (VSV) and the bunyavirus Rift Valley fever virus (RVFV) known to replicate in the cytoplasm of infected cells. Thus, cotton rats possess two Mx proteins that have selective antiviral activity that depends on their intracellular localization. We conclude that the Mx status of cotton rats diff …

Computer-Aided Discovery of Small-Molecule Inhibitors of Pathogenic New World Arenavirus Entry and Replication.

Pathogenic New World arenaviruses (NWAs), including Junín (JUNV) and Machupo (MACV) viruses, rely on host-virus entry processes that represe … opic NWAs and viruses that use alternative entry pathways, while showing no effect on the unrelated Rift Valley fever virus. In an hTfR1-expressing mouse model of JUNV infection, 22f was well tolerated, but did not confer protection. These results provide the foundation for further development and optimization of potent compounds that broadly inhibit infection by t …

Метод секвенирования (NNA) следующего поколения (NGS) для выявления источников сахарного питания в переносчиках комаров вируса Западного Нила в Израиле.

Москиты рода Culex представляют собой важные векторы патогенных арбовирусов в нашем регионе, включая вирусы Вест-Нил и Рифт-Вэлли. Чтобы лучше понять эпидемиологию и динамику передачи арбовирусов, нам нужно изучить поведение и экологию их векторов. Характер питания переносчиков комаров может оказаться весьма полезным при определении того, каким образом и где сосредоточить усилия по борьбе с этим заболеванием. Например, определение предпочтительных носителей крови у женщин может помочь в осуществлении потенциально эффективных стратегий целенаправленного контроля над женщинами-комаров. Определен

Совпадение в аннотации оригинала
Mosquitoes of the genus Culex comprise important vectors of pathogenic arboviruses in our region, including West Nile and Rift Valley Fever viruses. To improve our understanding of the epidemiology and transmission dynamics of arboviruses, we need to study the behavior and ecology of their vectors. The feeding patterns of the vector mosquitoes can be very us…

Emergent Viral Infections of the CNS.

Biological evolution of the microbiome continually drives the emergence of human viral pathogens, a subset of which attack the nervous syste … nt viral CNS infections that were described in the past 50 years (Influenza, West Nile Virus, Zika, Rift Valley Fever Virus, Hendra/Nipah, Enterovirus-A71/-D68, Human parechovirus, HIV, and SARS-CoV). Knowledge of these pathogens provides us the opportunity to respond and mitigate infection while at the same time prepare for inevitable arrival of unknown agents.

Insecticide resistance genes affect Culex quinquefasciatus vector competence for West Nile virus.

Insecticide resistance has been reported to impact the interactions between mosquitoes and the pathogens they transmit. However, the effect on vector competence for arboviruses still remained to be investigated. We examined the influence of two insecticide resistance mechanisms on vector competence of the mosquito Culex quinquefasciatus for two arboviruses, Rift Valley Fever virus (RVFV) and West Nile virus (WNV). Three Cx. quinquefasciatus lines sharing a common genetic background were used: two insecticide-resistant lines, one homozygous for amplification of the Ester2 locus (SA2), the other…

Insecticide resistance in Culex pipiens quinquefasciatus and Aedes albopictus mosquitoes from La Réunion Island.

Resistance to insecticides was monitored on Culex pipiens quinquefasciatus mosquitoes collected in twelve localities of La Réunion, a geographically isolated island of the Indian Ocean. This mosquito is of medical concern in the region as a known vector for filariasis and a potential vector for West Nile and Rift Valley Fever viruses. Our bioassays indicated the presence of resistance to all tested insecticides, i.e. organochlorides, organophosphates and pyrethroids. A molecular investigation revealed a higher frequency of resistance genes in the coastal areas compared to elevated rural sites,…

Pathogenesis of a phleboviral infection (Punta Toro virus) in golden Syrian hamsters.

The hamster, Mesocricetus auratus, was examined as a possible model for investigating the poorly defined pathogenesis of the family Bunyavir … stics of disseminated intravascular coagulation (DIC). The PTV-hamster model shares similarities to Rift Valley fever (phleboviral disease), which causes fatal disease in man and domesticated ruminants.

Infectious Agents of Non-Malarial Febrile Illnesses in 20 African Countries, 2019-2024: A Systematic Review and Meta-Analysis.

BACKGROUND: The growing attention to non-malarial febrile illnesses (NMFIs), driven by the decline in malaria cases across the African conti … and Borrelia spp. were common bacterial causes, while dengue, Crimean-Congo haemorrhagic fever and Rift Valley fever viruses predominated. Despite the predominance of molecular methods, most studies included the use of both molecular and serological methods. CONCLUSION: The causative agents of NMFIs in Africa are enormous and context-specific. These findings high …

[Use of satellites for public health purposes in tropical areas].

The epidemiological hallmark of the new millennium has been the emergence or recrudescence of transmissible diseases with high epidemic potential. Disease tracking is becoming an increasingly global task requiring implementation of more and more sophisticated control strategies and facilities for sustainable development. A promising initiative involves the use of satellite technology to monitor and forecast the spread of disease. The Health Early Warning System (HEWS) was designed based on successful application of satellite data in food programs as well as in other areas (e.g. weather, farmin

(Sero)prevalence of (re)emerging major arbovirus infections in Africa: a systematic review and meta-analysis protocol.

BACKGROUND: Arbovirus infection outbreaks are becoming more widely reported in Africa. However, it is still difficult and crucial to better understand arbovirus transmission patterns, disease trends, and burdens. The epidemiology of these infections-dengue virus (DENV), Zika virus (ZIKV), chikungunya virus (CHIKV), West Nile virus (WNV), Rift Valley fever virus (RVFV), and yellow fever virus (YFV)-is unfortunately not well understood. This review provides an epidemiological inventory of DENV, ZIKV, CHIKV, WNV, RVFV, and YFV infections in Africa, with helpful results for risk mapping and upcomi…