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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]
Highly pathogenic H5N1 avian influenza in a human appears to be far worse, killing over 50% of humans reported infected with the virus, although it is unknown how many cases (with milder symptoms) go unreported. In one case, a boy with H5N1 experienced diarrhea followed rapidly by a coma without developing respiratory or flu-like symptoms. [41]
Influenza A/H5N1 was first recorded in a small outbreak among poultry in Scotland [71] in 1959, with numerous outbreaks subsequently in every continent. [72] The first known transmission of A/H5N1 to a human occurred in Hong Kong in 1997, when there was an outbreak of 18 human cases resulting in 6 deaths. It was determined that all the infected ...
H5N1 is a shapeshifter, so to speak, due to its segmented DNA, Michael explains. “For example, if a human gets infected with a bird flu and also carries a human influenza A virus, these two ...
Even before H5N1 was a consideration, health officials cautioned against drinking raw milk or eating undercooked meat because both can harbor nasty germs like salmonella and E. coli. Cats have ...
H5N1 was first identified in wild geese in China in 1996 and soon spread among birds in Asia, jumping to people on hundreds of occasions along the way. More than half of those known infections ...
H5N1 influenza virus is a type of influenza A virus which mostly infects birds. H5N1 flu is a concern due to the fact that its global spread may constitute a pandemic threat.
The H5N1 outbreak has impacted commercial poultry since early 2022, causing cases in over 82 million farmed birds alone. It’s been deemed the worst bird flu outbreak in American history —and ...