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Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus, which causes the disease avian influenza (often referred to as "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 ]
H5N1 pre-pandemic vaccines exist in quantities sufficient to inoculate a few million people [4] and might be useful for priming to "boost the immune response to a different H5N1 vaccine tailor-made years later to thwart an emerging pandemic". [5] H5N1 pandemic vaccines and technologies to rapidly create them are in the H5N1 clinical trials ...
What to know about H5N1 disease spread and symptoms. Bird flu outbreak at Colorado farm as 5 workers reported positive: Experts warn of ‘turning point,’ call for urgent action.
And while the 2024–25 seasonal flu vaccine doesn’t protect against H5N1 bird flu, the more people who get the vaccine, the lower the chances of the current bird flu outbreak becoming a ...
A small H5N1 outbreak in humans in Hong Kong occurred then, [44] and sporadic human cases have occurred since 1997, carrying a high case fatality rate. [19] [62] The most recent flu pandemic was the 2009 swine flu pandemic, which originated in Mexico and resulted in hundreds of thousands of deaths. [34]
A person in Texas tested positive for avian influenza (H5N1), aka bird flu, amid an outbreak among dairy cows. What to know about transmission and symptoms.
Most human cases of bird flu in North America have been mild, a fact that’s underscored by a new study of the first 46 confirmed human H5N1 infections in the United States this year.
The main virus involved in the global outbreak is as H5N1 clade 2.3.4.4b, genetic diversification of which with other clades (such as 2.3.2.1c) has seen an evolution in the ability to cause significant outbreaks in a broader range of species, mammals included. [63] [64] [65]