Articles tagged with Avian Influenza
A new study found that nearly half of low pathogenic avian influenza viruses in northern pintail ducks in Alaska contained genes more closely related to Asian strains. This research validates surveillance sampling processes and demonstrates the effectiveness of genetic analysis in understanding virus exchange between continents.
A new study has found that a single low-dose booster vaccine can generate an excellent response in people who have been vaccinated up to 7 years ago. This means that proactively immunizing the public with stockpiled pre-pandemic vaccines could be used as a potential vaccination strategy against pandemic influenza.
Researchers at Duke University Medical Center found that a maternal diet rich in methyl donors increases the development and severity of asthma in mice. The study also identified specific genes modified by methylation as likely underlying causes of the increased disease severity.
Researchers have found that adding a new component to vaccines for influenza might enable broad protection against avian and seasonal influenza A viruses. Memory T cells from individuals infected with seasonal influenza A cross-react with H5N1, suggesting improved immunity.
Researchers led by Professor Ten Feizi aim to identify receptor molecules in the human respiratory tract to understand why H5N1 has not evolved into an effective pathogen. They also seek to determine how changes in the virus's binding protein may increase its ability to attach to and cause infection.
Scientists have discovered a 3D structure of an NS1 protein that suppresses human defenses against the flu virus, paving the way for new drug development. The breakthrough could lead to effective treatments for avian influenza and other human strains.
Indonesia has experienced the most human cases of bird flu and one of the highest mortality rates due to the disease. Development of better diagnostic methods and improved case management could lead to faster treatment with antiviral drugs, decreasing mortality.
Recent H9N2 viruses can transmit to ferrets in direct contact, but aerosol transmission is not observed. A single amino acid residue at the receptor-binding site plays a major role in transmission. The study suggests that establishment and prevalence of H9N2 viruses in poultry pose a significant threat to humans.
A bird-flu pandemic will likely be controlled through widespread vaccination, which must be broadly-protective and rapidly produced. The virus is highly pathogenic in humans, with a mortality rate over 60%. Improving diagnostic tools and treatment options are also crucial to managing the disease.
Researchers have developed a library of over 300 antibodies effective against H5N1 avian flu, offering potential treatment for infected individuals and a step towards a universal flu vaccine. The antibodies may also enable the design of vaccines with cross-subtype neutralizing activity.
Researchers analyzed genetic sequences of influenza A H5N1 virus to understand its migration patterns. The study showed that certain provinces in southern China and neighboring countries shared evolutionary history with the virus.
Researchers found that avian influenza viruses can infect children's cells more easily than adults' due to the widespread distribution of sialic acid receptors in children's lower respiratory tract. This may explain why avian H5N1 viruses can infect human upper respiratory tracts despite lacking traditional receptors.
The structure of hemagglutinin on influenza B virus provides key insights into potential mutations that could spark a pandemic. By comparing it to a similar protein on influenza A virus, researchers may be able to understand the changes needed for avian flu to infect humans.
Researchers at Baylor College of Medicine and Rice University have developed a molecular map of the influenza B virus's hemagglutinin protein. The study reveals similarities between the protein's sequence and function in flu A and B strains, suggesting that minor mutations could enable bird flu to spread among humans.
Human and avian influenza viruses target different cells in the lower respiratory tract, with human virus targeting upper respiratory tract cells and avian virus targeting deeper lung cells. The study provides insights into the pathogenesis of these divergent diseases.
A new biosensor can detect avian influenza virus in just minutes, improving quick identification and controlling outbreaks. The sensor is economical, field-deployable, sensitive to different strains and requires no labels or reagents.
Scientists at St. Jude Children's Research Hospital have found specific mutations that distinguish influenza viruses in birds from those that infect humans. These markers can be used to track changes in H5N1 avian influenza strains threatening humans, suggesting potential adaptation and spread.
Wildlife experts from WCS and FAO argue that keeping wild animals separate in wildlife markets can prevent disease outbreaks. Closing these trade hubs could significantly reduce the threat of emerging diseases like avian flu.
A team of scientists at NIAID has developed a strategy to generate vaccines and therapeutic antibodies that can target predicted H5N1 mutants before they emerge. By identifying key mutations in the HA protein, they created vaccines and isolated new antibodies that could neutralize both bird- and human-adapted forms of the virus.
Researchers estimate that less than half of household infections could be prevented with current antiviral drugs, highlighting the need for continuous monitoring. The study provides a method for detecting emerging secondary human-to-human transmission using easily collected data.
A study predicts that using Tamiflu prophylactically could reduce illness and death rates during an influenza pandemic by half, with a cost savings of $70,000 per 1,000 population. Prophylaxis with antivirals or vaccines is considered a crucial strategy in the early months of a pandemic.
A nationwide survey reveals that most Americans are aware of avian influenza but lack knowledge to inform their food choices. Only a small percentage believe cooking chicken properly kills the virus.
A study by researchers at the University of Iowa found that veterinarians with occupational exposure to birds have significantly higher levels of antibodies against avian influenza viruses. The greatest risk factor for infection was examining sick birds, highlighting the need for priority access to pandemic vaccines and antivirals.
Researchers used human antibodies derived from immune cells of H5N1 survivors to treat and protect mice from the virus. The study found that these antibodies could neutralize the virus and prevent death in mice, offering a promising therapeutic approach for pandemic influenza.
The new IHR aims to prevent national public health emergencies from spreading internationally, but poorer countries lack the capacity to meet demands. China fears a Taiwan public health emergency could spread globally, highlighting the need for global surveillance.
Researchers have identified seven new host species for H5N1 avian influenza, including four goose species and the common gull, in a study of over 36,000 wild migratory birds. The findings provide important insights into the ecology and epidemiology of various global strains of the virus.
Experts argue that researchers should focus broadly on influenza viruses, improving knowledge of basic biological means, enhancing surveillance, and developing new antivirals and diagnostics. This approach can also help combat seasonal influenza, a major public health concern in the US.
A model predicting the probability of infection from one farm to another has been developed by Gert-Jan Boender and colleagues, highlighting two poultry-dense areas in the Netherlands where epidemic spread is possible. The authors conclude that local control measures are unlikely to halt an unfolding epidemic in these regions.
The University of Alaska Fairbanks will collect and test over 8,000 samples from Alaska and Russia to understand the genetic changes of flu viruses and their success in animal hosts. The research aims to develop new knowledge on the ecology of the influenza virus and its impact on bird populations.
The University of Minnesota will receive funding to monitor domestic and international wild bird populations for avian influenza viruses, aiming to rapidly identify pandemic threats. The center's research will support public health strategies for controlling the impact of an influenza pandemic.
A review of 1918 pandemic flu studies reveals more unanswered questions than answers, particularly regarding the origins and impact on young adults. Further study is crucial for pandemic planning and preparedness efforts.
Researchers compared the immune responses of animals infected with 1918 and H5N1 influenza viruses, finding similar yet distinct reactions. The study aims to better understand how these viruses cause disease and develop new treatments.
Researchers found that low-pathogenic avian influenza viruses can cause mild illness in migratory swans, slowing down their migration and feeding patterns. This discovery highlights the impact of these viruses on wild birds and could affect the rate of spread of avian influenza.
A human trial of a DNA vaccine designed to prevent H5N1 avian influenza infection began in December 2006. The vaccine instructs human cells to make proteins that act as a vaccine against the virus, providing broad immune responses without infectious material.
Researchers predict 62 million deaths in a year if similar pandemic occurs, with 96% of fatalities in developing nations. The study's findings suggest that wealth disparity plays a significant role in disease burden, with higher-income individuals less likely to die.
Researchers at Rice University and UT Austin have identified a promising antiviral drug target in the long, flexible tail of the nucleoprotein protein. Minor changes to this region prevent the protein from fulfilling its role in structural columns that transmit viral copies.
Researchers at the University of New Hampshire are using satellite observations to track the ecology of avian influenza and develop early warning systems for potential outbreaks. By analyzing environmental data from satellites, they aim to understand how the virus spreads among poultry and wild birds in China.
Developed using best evidence and expert panels, a triage protocol prioritizes access to ventilators and antiviral medications in patients with severe symptoms. The protocol aims to ensure fair distribution of limited resources during an overwhelmed healthcare system.
The U.S. Vaccine and Infectious Disease Organization has discovered a crucial pathway that supports the influenza A virus's ability to reproduce itself. This finding could lead to the development of new live vaccines and antiviral drugs for influenza epidemics and pandemics.
Scientists have developed an inexpensive gene chip test that can detect H5N1 infections with high accuracy, providing a significant advantage over existing tests. The MChip has the potential to revolutionize laboratory testing for influenza, enabling rapid and accurate identification of flu viruses, including avian influenza H5N1.
The H5N1 avian influenza has been detected in 55 countries, but critical information about wild birds is often recorded inaccurately or not at all. This lack of data can lead to unwarranted assumptions and conclusions that affect public perceptions and resource allocation.
Researchers found common wood ducks and laughing gulls susceptible to H5N1 avian influenza viruses, shedding most of the virus through their respiratory tract. The study provides valuable insights into detecting the disease in live birds by swabbing their mouths and throats.
Researchers developed live attenuated vaccines using weakened influenza virus proteins and found they elicited broad and lasting immunity in mice and ferrets. The vaccines provided protection against different H5N1 viruses that emerged years later, demonstrating potential as a future treatment option for avian flu.
Researchers have developed a live, attenuated H5N1 avian flu vaccine that protected mice and ferrets from deadly infection with naturally occurring H5N1 flu viruses. The vaccine demonstrated cross-protection against different emerging H5N1 virus strains.
A new microchip-based test called FluChip can distinguish among 72 influenza strains in under 12 hours, enhancing global flu surveillance efforts. This technology has the potential to increase laboratory diagnostic capacity and provide critical information on the geographic origin of emerging viruses.
The US Geological Survey (USGS) has developed a database and web application called HEDDS to share information on sample collection sites, bird species sampled, and test results. The database provides current information on wild bird sampling for early detection of highly pathogenic avian influenza (HPAI) in the United States.
The US government has approved a multi-million dollar surveillance network to track the avian flu virus overseas. The Global Avian Influenza Network for Surveillance (GAINS) will provide valuable forecasts on viral storms, enabling the prevention of avian flu spread and preparation for outbreaks.
A two-dose regimen of the H5N1 vaccine induced the highest antibody response after 42 days, with all formulations well-tolerated. However, the level of post-vaccination antibodies needed for protection against the H5 N1 virus remains unknown.
The H5N1 virus poses a significant threat, prompting researchers to revisit studies of influenza A viruses. The immune system response to H5N1 can be catastrophic, with a 'cytokine storm' causing rapid death. Understanding the battle between the immune system and influenza A viruses holds promise for better therapies and vaccines.
The Asia-Pacific region is facing challenges in pandemic preparedness, with some countries lacking comprehensive operational guidance manuals. However, countries like Hong Kong, Australia, and New Zealand have developed robust plans to respond to pandemic influenza, drawing from their experience with SARS.
A new study by St. Jude Children's Research Hospital has shown a DNA-based vaccine to be highly effective in protecting mice against lethal challenges with the H5N1 avian influenza virus. The vaccine targets two conserved viral proteins and one variable protein, providing complete protection in mice.
A recent study by London School of Hygiene & Tropical Medicine found considerable gaps in pandemic preparedness across Europe. The report analyzed national plans and concluded that increased cooperation is needed to ensure effective response to a pandemic.
The H5N1 avian flu vaccine has shown promise in inducing immune responses in healthy adults. Among the 99 participants who received the high-dose vaccine, 54% developed neutralizing antibodies to the vaccine at a serum dilution of 1:40 or greater.
Researchers found that horse antibodies to H5N1 protected dog kidney cells and mice infected with the deadly virus from death. Low doses of antibody (50µg) protected 70% of mice, while higher doses (100µg) offered full protection.
Researchers at Purdue University have developed a national surveillance network using pet medical records to predict disease outbreaks in humans and animals. The program found correlations between flea and tick infestations and Lyme disease, as well as an increase in canine leptospirosis cases over the past decade.
A new study describes the structure of an H5 protein from a highly pathogenic strain of H5N1 avian influenza virus, comparing it to other pandemic influenza A viruses. The research also discusses a potential route for H5N1 to mutate and acquire human specificity.
Researchers propose using chemotherapy to treat avian flu, citing success in treating a related immune disorder called haemophagocytic lymphohistiocytosis. The treatment involves etoposide and corticosteroids, and has shown promise in reducing mortality rates in similar cases.
Researchers genetically engineered an adenovirus to produce a protein from the H5N1 influenza virus, protecting mice from death and weight loss when infected with the virus. The human adenovirus vaccine generated specific T cells that helped clear the virus, offering a viable option for potential pandemic vaccination.
A University of Illinois scholar warns that avian influenza poses a significant threat to international security, citing the potential for human-to-human transmission and widespread economic disruption. The expert emphasizes the need for global coordination and increased surveillance to prevent the spread of the virus.
The spread of avian influenza in Turkey highlights the need for increased global funding to combat bird flu and prevent human pandemics. Donors at the International Pledging Conference acknowledged that funds should be scaled up to address this failure, with estimated costs ranging from $1.2 billion to $1.4 billion.