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Although a wide variety of bird species have been shown to contract and spread Influenza A virus subtype H5N1, from waterfowl to poultry and birds of prey, mammalian infections have been of particular interest to researchers due to their potential to develop mutations that increase the risk of mammal-to-mammal spread and transmission to and among humans.
[8] [10] In 2020, reassortment (genetic "swapping") between these H5-2.3.4.4b viruses and other strains of avian influenza led to the emergence of a H5N1 strain with a H5-2.3.4.4b gene. [8] The virus then spread across Europe, detected there in autumn, before spreading to Africa and Asia. [1]
Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus, which causes the disease avian influenza or "bird flu." It is enzootic (maintained in the population) in many bird populations, and also panzootic (affecting animals of many species over a wide area). [ 1 ]
Bird flu is a disease caused by infection with avian influenza A viruses, which spread naturally among wild aquatic birds and circulate in poultry. Occasionally, bird flu viruses spread to mammals ...
An unprecedented and highly contagious bird flu outbreak in the sub-Antarctic has spread to mammals, British officials said Thursday, as experts warned the disease poses a significant threat to ...
H5N1 avian influenza, more commonly known as bird flu, has infected more than 100 million birds in the U.S. and almost 500 dairy cattle herds across 15 states. The virus has popped up in mammals ...
In October 2004 researchers discovered H5N1 is far more dangerous than previously believed because waterfowl, especially ducks, were directly spreading the highly pathogenic strain of H5N1 to chickens, crows, pigeons, and other birds and that it was increasing its ability to infect mammals as well. From this point on, avian influenza experts ...
Another study, published in the journal Emerging Infectious Diseases in February, found the bird flu virus has adapted to spread between birds and mammals. Researchers found nearly identical ...