21 нояб. 2009 г. · This study suggests that one reason why H5N1 has not yet caused a pandemic is that two genetic mutations would need to happen to the virus .
Was there a pandemic in 1997?
In 1997, at least a few hundred people became infected with the avian A/H5N1 flu virus in Hong Kong and 18 people were hospitalized. Six of the hospitalized persons died.
Why isn't the avian flu a pandemic?
The viruses occasionally infect humans and the H5N1 strain has infected more than 400 people since 2003. H5N1 has a high mortality rate in humans, at around 60 per cent, but to date there has been no sustained human to human transmission of the virus, which would need to happen in order for a pandemic to occur.
Can H5N1 become a pandemic?
Although the human cases of infection with influenza A/H5N1 which started in Southeast Asia are of concern, it is the risk that the same virus might evolve to produce the next pandemic which is of key concern.
What year was the last pandemic?
The 1918 Spanish flu was the first of three flu pandemics caused by H1N1 influenza A virus; the most recent one was the 2009 swine flu pandemic.
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