Warming World Could Alter West Nile Transmission in U.S.

MONDAY, Sept. 28, 2020 -- Climate change could give West Nile virus a boost in some areas of the United States, but reduce its spread in other regions, a new study suggests. The mosquito-borne virus spreads most efficiently in the United States at...
Source: Drugs.com - Daily MedNews - Category: General Medicine Source Type: news

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On 22 August, a common whitethroat in the Netherlands tested positive for West Nile virus lineage 2. The same bird had tested negative in spring. Subsequent testing ofCulex mosquitoes collected in August and early September in the same location generated two of 44 positive mosquito pools, providing first evidence for enzootic transmission in the Netherlands. Sequences generated from the positive mosquito pools clustered with sequences that originate from Germany, Austria and the Czech Republic.
Source: Eurosurveillance - Category: Infectious Diseases Authors: Source Type: research
We report that the presence of infections led to expansion of a novel subpopul ation of long-lived, Ly6C+ Tn cells with rapid effector function. Monoinfection with West Nile virus transiently, and polymicrobial exposure persistently, enhanced Ly6C expression on CD5hi cells, the latter yielding a numerical Tn cell increase in the lymph nodes. Conversion and expansion of Ly6C+ T n cells depended on IFN-I, that upregulated MHC class I expression and enhanced trophic TCR signaling in Tn cells. IFN-I-mediated signals extended lifespan, optimized homing to secondary and tertiary sites, and drove Ly6C+ Tn cells to higher “c...
Source: GEO: Gene Expression Omnibus - Category: Genetics & Stem Cells Tags: Expression profiling by high throughput sequencing Mus musculus Source Type: research
In conclusion, the earlier a zoonotic pathogen can be detected in the environment, in wildlife or in domestic animals; and the better human, animal and environmental surveillance communicate with each other to prevent an outbreak, the lower are the cumulative costs.
Source: Infectious Diseases of Poverty - Category: Infectious Diseases Source Type: research
(STOCKHOLM) — Americans Harvey J. Alter and Charles M. Rice and British-born scientist Michael Houghton won the Nobel Prize for medicine on Monday for their discovery of the hepatitis C virus, a major source of liver disease that affects millions worldwide. Announcing the prize in Stockholm, the Nobel Committee noted that the trio’s work identified a major source of blood-borne hepatitis that couldn’t be explained by the previously discovered hepatitis A and B viruses. Their work, dating back to the 1970s and 1980s, has helped saved millions of lives, the committee said. “Thanks to their discovery, ...
Source: TIME: Science - Category: Science Authors: Tags: Uncategorized News News Desk wire Source Type: news
any Usutu virus (USUV), a mosquito-borne zoonotic flavivirus discovered in South Africa in 1959, has spread to many European countries over the last 20 years. The virus is currently a major concern for animal health due to its expanding host range and the growing number of avian mass mortality events. Although human infections with USUV are often asymptomatic, they are occasionally accompanied by neurological complications reminiscent of those due to West Nile virus (another flavivirus closely related to USUV). Whilst USUV actually appears less threatening than some other emergent arboviruses, the lessons learned from ...
Source: Viruses - Category: Virology Authors: Tags: Review Source Type: research
Amir Steinman West Nile virus (WNV) and Usutu virus (USUV) are arboviruses transmitted by mosquito vectors. Whereas WNV is endemic in Israel, the Middle East, Europe, and in the Americas, data regarding the prevalence of USUV in the Middle East is limited. While both viruses share similar reservoirs and vectors, exposure of horses in the area to USUV have never been assessed. The aim of this study was to estimate the seroprevalence and co-exposure of WNV and USUV in horses in Israel. A total of 327 serum samples from healthy unvaccinated horses in Israel collected in 2018 were tested for neutralizing antibodies again...
Source: Viruses - Category: Virology Authors: Tags: Communication Source Type: research
Abstract The mosquito-borne flavivirus Usutu virus (USUV) has recently emerged in birds and humans in Europe. Symptoms of a USUV infection resemble those of West Nile virus (WNV); further, the close antigenic relationship of domain III (DIII) of the USUV and WNV envelope (E) proteins has prevented the development of a reliable serological test to distinguish USUV from WNV. To begin to address this deficiency, we identified ten different sequence groups of DIII from 253 complete and 80 partial USUV genome sequences. We solved the DIII structures of four groups, including that of the outlying CAR-1969 strain, which ...
Source: Virology - Category: Virology Authors: Tags: Virology Source Type: research
Warming climate may increase US areas where West Nile virus spreads efficiently More at https://www.nsf.gov/discoveries/disc_summ.jsp?cntn_id=301296&WT.mc_id=USNSF_1 This is a Research News item.
Source: NSF Discoveries - Category: Science Source Type: research
;zkul A Abstract Turkey serves as a natural hub for the dissemination of vector-borne viruses and provides many suitable habitats with diverse ecologies for introduction and establishment of new pathogens. This manuscipt provides an updated systematic review and meta-analysis of the vector-borne viruses documented in Turkey. Following web-based identification, screening and eligibility evaluation, 291 published reports were reviewed. The publications were categorized and listed as a supplementary bibliography accompanying the manuscript. In brief, Crimean-Congo hemorrhagic fever virus (CCHFV) and West Nile virus (...
Source: Antiviral Research - Category: Virology Authors: Tags: Antiviral Res Source Type: research
The temperature-dependence of many important mosquito-borne diseases has never been quantified. These relationships are critical for understanding current distributions and predicting future shifts from climate change. We used trait-based models to characterize temperature-dependent transmission of 10 vector –pathogen pairs of mosquitoes (Culex pipiens,Cx. quinquefascsiatus,Cx. tarsalis, and others) and viruses (West Nile, Eastern and Western Equine Encephalitis, St. Louis Encephalitis, Sindbis, and Rift Valley Fever viruses), most with substantial transmission in temperate regions. Transmission is optimized at inter...
Source: eLife - Category: Biomedical Science Tags: Ecology Epidemiology and Global Health Source Type: research
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