Influenzavirus A
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Influenzavirus A is a genus of the Orthomyxoviridae family of viruses. Influenzavirus A includes only one species: Influenza A virus which causes influenza in birds and some mammals. Strains of all subtypes of influenza A virus have been isolated from wild birds, although disease is uncommon. Some isolates of influenza A virus cause severe disease both in domestic poultry and, rarely, in humans. Occasionally viruses are transmitted from wild aquatic birds to domestic poultry and this may cause an outbreak or give rise to human influenza pandemics.
Influenza A viruses are negative sense, single-stranded, segmented RNA viruses. There are several subtypes, labeled according to an H number (for the type of hemagglutinin) and an N number (for the type of neuraminidase). There are 16 different H antigens (H1 to H16) and nine different N antigens (N1 to N9). The newest H type (H16) was isolated from black-headed gulls caught in Sweden and the Netherlands in 1999 and reported in the literature in 2005.
Each virus subtype has mutated into a variety of strains with differing pathogenic profiles; some pathogenic to one species but not others, some pathogenic to multiple species.
For more information about Influenzavirus A, read the full article at
Wikipedia.
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News tagged with influenza a virus
Flu focus: NIH project aims for better drugs
Oct 20, 2009 |
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Rice University scientists have won a $1.5 million grant from the National Institutes of Health to scrutinize the influenza A virus for clues that could lead to more effective antiviral drugs. Strains of influenza A include ...
Tamiflu Metabolite Found in Sewage Discharge, River Water
Oct 01, 2009 |
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(PhysOrg.com) -- In a study published September 28th ahead of print in the peer-reviewed journal Environmental Health Perspectives, researchers measured oseltamivir carboxylate (OC), the active metabolite of the popular anti-i ...
Cyber exploring the 'ecosystems' of influenzas
Aug 05, 2009 |
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Predicting the infection patterns of influenzas requires tracking both the ecology and the evolution of the fast-morphing viruses that cause them, said a Duke University researcher who enlists computers to model such changes.
A New Way of Treating the Flu
Jul 06, 2009 |
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(PhysOrg.com) -- What happens if the next big influenza mutation proves resistant to the available anti-viral drugs? This question was presenting itself to scientists and health officials recently at the World ...
Rapid approach to identify influenza A virus mutations and drug resistance developed
May 28, 2009 |
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Genome Institute of Singapore scientists, led by Christopher Wong, Ph.D., have developed a novel approach to uncover the complete sequence of any influenza A virus, including H1NI, with just a quick nasal swab or nasal pharyngeal ...
Scientists develop mathematical model to predict the immune response to influenza
May 13, 2009 |
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Researchers at the University of Rochester have developed a mathematical model to predict immune responses to infection with influenza A viruses, including novel viruses such as the emergent 2009 influenza A (H1N1). This ...
Study: Fluid buildup in lungs is part of the damage done by the flu
Feb 10, 2009 |
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In a fight against respiratory infections, the body typically produces a little fluid to help the lungs generate a productive cough. But new research suggests that the influenza virus can tip the balance toward too much fluid ...
