Last Year's Flu Shot Protected Only 1 in 5
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Title : Last Year's Flu Shot Protected Only 1 in 5
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Title : Last Year's Flu Shot Protected Only 1 in 5
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Last season's flu shot protected as few as one in five people and this year's could be similarly ineffective, researchers said Monday, calling for a better way to make the vaccine.
The reason just 20 to 30 percent of people were protected by the 2016-2017 flu shot was a mutation in the H3N2 strain of the virus, which did not show up in the mass-produced vaccine that is grown using eggs, said the report in the Proceedings of the National Academy of Sciences.
Flu vaccines work by delivering purified proteins from the outer layer of dead flu viruses, which primes the immune system to fight off a new invasion.
But if a virus mutates, and the vaccine doesn't change to match it, effectiveness is lost, said lead author Scott Hensley, associate professor of microbiology at the University of Pennsylvania.
"The 2017 vaccine that people are getting now has the same H3N2 strain as the 2016 vaccine, so this could be another difficult year if this season is dominated by H3N2 viruses again."
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Flu vaccines work by delivering purified proteins from the outer layer of dead flu viruses, which primes the immune system to fight off a new invasion.
But if a virus mutates, and the vaccine doesn't change to match it, effectiveness is lost, said lead author Scott Hensley, associate professor of microbiology at the University of Pennsylvania.
"The 2017 vaccine that people are getting now has the same H3N2 strain as the 2016 vaccine, so this could be another difficult year if this season is dominated by H3N2 viruses again."
More here
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