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At the present moment, we are at phase 3 on the scale, meaning a new influenza virus subtype is causing disease in humans, but is not yet spreading efficiently and sustainably among humans. [29] So far, H5N1 infections in humans are attributed to bird-to-human transmission of the virus in most cases.
A/H5N1 virus can also infect mammals (including humans) that have been exposed to infected birds; in these cases, symptoms are frequently severe or fatal. [2] A/H5N1 virus is shed in the saliva, mucus, and feces of infected birds; other infected animals may shed bird flu viruses in respiratory secretions and other body fluids (such as milk). [3]
Instead, the age-fatality curve of H5N1 influenza attacks in humans resembles that of the 1918 Spanish pandemic flu, and is the opposite of the mortality curve of seasonal flu strains, since seasonal influenza preferentially kills the elderly and does not kill by cytokine storm.
How does bird flu transmit to humans? Transmission of bird flu viruses to humans is rare. According to the WHO , since 2003, there have been approximately 903 human H5N1 cases in 24 countries.
According to the U.S. Centers for Disease Control, there have been 57 cases of bird flu in humans this year, ... (H5N1) virus as a way to develop antibodies against A(H5N1) virus to protect ...
Some experts worry that H5N1 bird flu might be to blame. ... The testing — which is intended to monitor the prevalence of "normal" flu viruses that affect humans — has also shown a moderate to ...
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.
At baseline, bird flu is usually severe in humans. Of the 863 reported H5N1 bird flu cases reported worldwide between 2003 and 2021, 456 ended in death, according to data from the World Health ...