Sometimes, skin tests can be done using diluted portions of the influenza vaccine itself.
Now, only people with severe egg allergies are advised not to get an influenza vaccine.
Prior recommendations had suggested that anyone with egg allergies not receive an influenza vaccine.
Mitsui Norin in Japan has taken out a patent to use gum to deliver an influenza vaccine.
Influenza vaccine will only prevent infection 60% to 70% of the time, in the best of cases.
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The study found no evidence that the influenza vaccine increased the risk of fetal death in pregnant women.
The authors examined more than 12, 000 articles, studies and transcripts dating back to 1936 and interviewed 88 experts on the influenza vaccine.
The ad urges viewers to become informed about influenza and how to stay well during the flu season without resorting to the influenza vaccine.
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Now, it seems, non-U.S. firms are rushing to make influenza vaccine.
She recommended parents protect their children under the age of 18 with a seasonal influenza vaccine, since seasonal flu kills 50 to 100 children per year, she said.
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The only side effects are swelling and pain at the injection site, but "these are occurring at rates that are expected and usually seen with seasonal influenza vaccine, " Fukuda said.
While hand washing and covering sneezes are parts of a larger strategy to prevent the spread of influenza, influenza vaccine continues to be the best way to protect against the disease.
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The influenza vaccine is safe and effective.
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"It was debated by the CDC Advisory Committee on Immunization Practices for many years, and the indication for the use of influenza vaccine for an increasing number of groups on a piecemeal basis didn't make sense, " Schaffner said.
But against a particular strain of Influenza B, the vaccine is proving completely ineffective.
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"We simply need a better vaccine against influenza, one that works better and lasts longer, " Frieden said.
There, Escherichia coli bacteria are growing to produce an experimental vaccine against influenza.
Nearly 90 million doses of vaccine for seasonal influenza already have been distributed, out of a total of 114 million available doses.
In the end, the influenza claimed one life, but the vaccine that was supposed to guard against it killed 32 people and seriously injured hundreds.
In diseases for which there is no private vaccine market, such as pandemic influenza, or for which cases are concentrated in poor countries, such as malaria and tuberculosis, governments and public-private partnerships have stepped in to subsidize development.
Each year, the vaccine is made from three strains of the influenza virus that researchers suspect will be the most active.
"It's the best vaccine we have, but there are cases of influenza that occur despite immunization, " Schaffner said.
"It's the best vaccine we have, but there are cases of influenza that occur despite immunization, " Schaffner said on "CNN Newsroom" Thursday morning.
This year's North American vaccine is made from three viruses: two types of influenza A virus (H3N2 and H1N1) and an influenza B virus.
The reason for that is that the influenza virus has a rapid rate of mutation, forcing companies that manufacture the vaccine to make their best guess as to which flu types will be more prevalent in a given season.
Michael Osterholm, director of the Minnesota Center of Excellence for Influenza Research and Surveillance at the University of Minnesota, believes people should get the vaccine, but he worries that the current policy gives the impression the vaccine is more effective than it actually is.
As of January 5, the CDC said Friday, the predominant virus in the United States was an influenza A (H3N2) virus that matched well with the H3N2 virus represented in the vaccine.
Influenza shots contain tiny amounts of egg protein, with varying amounts found in different brands of the vaccine.
Of the influenza B viruses tested between October 1 and January 5, 66.7% were the type represented in the vaccine.
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