More than two years into the COVID-19 pandemic, people are realizing that the "new normal" will probably involve learning to co-exist with SARS-CoV-2. Some treatments are available, but with new variants emerging, researchers ...
Jun 29, 2022
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It happens every year, especially in winter. A virus saunters into your wide-open respiratory tract, worms its way into lung cells, and, next thing you know, you're lying in bed with a fever, aches, and chills—classic symptoms ...
Jun 1, 2022
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Researchers have identified two antibodies that protect mice against lethal infections of influenza B virus, report scientists at Washington University School of Medicine in St. Louis and Icahn School of Medicine at Mount ...
Sep 24, 2020
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The seasonal flu is caused by different subtypes of Influenza A virus and typically leads to the death of half a million people each year. In order to better understand this virus and how it spreads, University of Minnesota ...
Sep 19, 2018
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A new, double-layered nanoparticle vaccine made with peptides has been found to effectively protect mice against influenza A virus, according to a study led by Georgia State University.
Jul 30, 2018
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Researchers have developed a universal vaccine to combat influenza A viruses that produces long-lasting immunity in mice and protects them against the limitations of seasonal flu vaccines, according to a study led by Georgia ...
Jan 24, 2018
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Lactic acid bacteria, commonly used as probiotics to improve digestive health, can offer protection against different subtypes of influenza A virus, resulting in reduced weight loss after virus infection and lower amounts ...
Dec 13, 2017
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A team of researchers, co-led by a University of California, Riverside professor, has found a long-sought-after mechanism in human cells that creates immunity to influenza A virus, which causes annual seasonal epidemics and ...
Dec 5, 2016
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(Medical Xpress)—A team of researchers at Peking University has developed a new type of vaccine that they claim may allow for a new approach to generating live virus vaccines which could conceivably be adapted to any type ...
Your birth year predicts—to a certain extent—how likely you are to get seriously ill or die in an outbreak of an animal-origin influenza virus, according to a study co-led by researchers from the University of Arizona ...
Nov 10, 2016
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Influenzavirus A Influenzavirus B Influenzavirus C Isavirus Thogotovirus
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.
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