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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 ]
In December, a HPAI H5N1 subtype of clade 2.3.4.4b was found in a captive Asian black bear and in wild and captive birds in a wildlife park in France. [17] A human case of H5N1 was reported in the U.S. in April, "though this detection may have been the result of contamination of the nasal passages with the virus rather than actual infection."
Avian flu virus can last indefinitely at a temperature dozens of degrees below freezing, as is found in the northernmost areas that migratory birds frequent. [citation needed] Heat kills H5N1 (i.e. inactivates the virus). Influenza A viruses can survive: Over 30 days at 0 °C (32.0 °F) (over one month at freezing temperature)
Credit - Paul Maguire—Getty Images. A ny time a person catches H5N1, or bird flu, their infection is a chance for the virus to mutate in the wrong direction. When someone dies from the bird flu ...
Scientists also know a lot more about H5N1 bird flu than they did the SARS-CoV-2 virus, and the US has been preparing for the threat of a new flu outbreak for a long time. Still, the virus is ...
Samples from wastewater plants across the nation show an increase in multiple flu viruses. Some experts worry that H5N1 bird flu might be to blame. Flu season is over, but there is a viral surge ...
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.
The virus can spread rapidly through poultry flocks and among wild birds. [9] A particularly virulent strain, influenza A virus subtype H5N1 (A/H5N1) has the potential to decimate domesticated poultry stocks and an estimated half a billion farmed birds have been slaughtered in efforts to contain the virus. [10]