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Usually other differences also exist. Currently, there is no human-adapted form of H5N1 influenza, so all humans who have caught it so far have caught avian H5N1. Human flu symptoms usually include fever, cough, sore throat, muscle aches, conjunctivitis and, in severe cases, severe breathing problems and pneumonia that may be fatal.
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]
The spread of the H5N1 bird flu virus among dairy cows has worried health experts, who say it increases the risk of the virus becoming a greater threat to humans. (Tomas Ovalle / For The Times)
Influenza A virus subtype H5N1 (A/H5N1) is a subtype of the influenza A virus, which causes influenza (flu), predominantly in birds. It is enzootic (maintained in the population) in many bird populations, and also panzootic (affecting animals of many species over a wide area). [1]
Chickens are pictured at a poultry farm in Mexico on June 6, 2024. Credit - Ulises Ruiz/AFP—Getty Images. A t least 58 people in the U.S. have been infected by the H5N1 bird flu virus this year ...
H5N1 bird flu samples collected from a severely ill patient in Louisiana show signs of mutations that may make the virus more transmissible to humans, the Centers for Disease Control and ...
The true fatality rate may be lower because some cases with mild symptoms may not have been identified as H5N1. [3] H5N1 infections in humans are generally caused by bird to human transmission of the virus. Until May 2006, the WHO estimate of the number of human to human transmissions had been "two or three cases".
The first severe case of bird flu in the U.S. is showing signs of mutation, stoking fears that the virus could become more transmissible among humans, the U.S. Centers for Disease Control and ...