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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.
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.
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]
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.
Bird flu, a.k.a. H5N1, has dominated headlines in the U.S. for months. But while this illness is known worldwide for having a high mortality rate, the vast majority of infections in America have ...
Bird flu is a scary illness with a high mortality rate. But so far, infections in the U.S. have been relatively mild—until now. A patient in Louisiana has been hospitalized with a severe case of ...
H5N1 was also detected in a pig in Oregon, the first ever reported case in the USA. [96] Meanwhile, by late November human cases of H5N1 in the USA increased to over fifty for the year with infections being reported in seven states. [97] On November 7, the CDC reported asymptomatic bird flu infection in 4 workers at dairy farms.
As H5N1 bird flu spreads among California dairy herds and southward-migrating birds, health officials announced Friday that six more human cases of infection: five in California and one in Oregon ...