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H5N1 influenza virus is a type of influenza A virus which mostly infects birds. H5N1 flu is a concern because its global spread may constitute a pandemic threat. The yardstick for human mortality from H5N1 is the case-fatality rate (CFR); the ratio of the number of confirmed human deaths resulting from infection of H5N1 to the number of those confirmed cases of infection with the virus.
As the bird flu continues to spread ... and are expected to increase from last year by about 20% in 2025, compared to about 2.2% for ... staffing in high-level talks on Ukraine war. News.
How deadly is the bird flu? The US has reported its first death from avian influenza, H5N1. ... In comparison, seasonal influenza causes an estimated 4,900 to 51,000 deaths every year in the U.S., ...
Avian influenza, also known as avian flu or bird flu, is a disease caused by the influenza A virus, which primarily affects birds but can sometimes affect mammals including humans. [1] Wild aquatic birds are the primary host of the influenza A virus, which is enzootic (continually present) in many bird populations.
Commonly referred to as bird flu, it’s a highly contagious viral disease affecting domestic poultry, wild birds, and, in some cases, mammals … including humans. The recent rise in Avian ...
While other H5N1 influenza strains are known, they are significantly different on a genetic level from a highly pathogenic, emergent strain of H5N1, which was able to achieve hitherto unprecedented global spread in 2008. [1] The H5N1 strain is a fast-mutating, highly pathogenic avian influenza virus (HPAI) found in multiple bird species. It is ...
[26] [27] [28] Further sequencing determined that at least one of the two cases was from an older H5N1 clade, 2.3.2.1c, which had circulated as a common H5N1 strain in Cambodia for many years, rather than the more recent clade 2.3.4.4b, which had caused mass poultry deaths since 2020. This older clade had jumped to humans in the past yet hadn't ...
Bird flu has infected nearly 70 people in the U.S., with one death, since last April. The CDC report said the virus was found in three out of 150 veterinarians who were tested in September 2024.