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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.
However, many experts say the H5N1 case fatality rate — which estimates the proportion of deaths among people diagnosed — has some caveats. "We have to look at (these numbers) carefully," says ...
Human infectious diseases may be characterized by their case fatality rate (CFR), the proportion of people diagnosed with a disease who die from it (cf. mortality rate).It should not be confused with the infection fatality rate (IFR), the estimated proportion of people infected by a disease-causing agent, including asymptomatic and undiagnosed infections, who die from the disease.
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]
Scientists say the world needs to learn more about H5N1 bird flu and how it spreads ... there was a fatality rate of 54 ... Los Angeles TV anchor Chauncy Glover's cause of death revealed. Finance.
A patient receives a dose of COVID-19 vaccine. The global case fatality rate from COVID-19 is approximately 1.4%. The global case fatality rate from H5N1, a viral infection, is approximately 52%.
Between 2003 and December 2024, the World Health Organization has recorded 963 cases of confirmed H5N1 influenza, leading to 465 deaths. [79] The true fatality rate may be lower because some cases with mild symptoms may not have been identified as H5N1. [80]
Although California dairy farmers anticipated a bird flu mortality rate of less than 2%, some say between 10% and 15% of infected cattle are dying. ... In the last week, the H5N1 virus has been ...