how effective has the flu vaccine been?
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A 2012 meta-analysis found that flu vaccination was effective 67 percent of the time; the populations that benefited the most were HIV-positive adults aged 18 to 55 (76 percent), healthy adults aged 18 to 46 (approximately 70 percent), and healthy children aged six months to 24 months (66 percent).
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A 2012 meta-analysis found that flu vaccination was effective 67 percent of the time; the populations that benefited the most were HIV-positive adults aged 18 to 55 (76 percent), healthy adults aged 18 to 46 (approximately 70 percent), and healthy children aged six to 24 months (66 percent).
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Luckily, this year's flu vaccine is a 100% match with H1N1, which has accounted for about 82% of the influenza A out there. The vaccine is also a 100% match with B/Yamagata, a far less common virus that makes up just 2% of the influenza B circulating.
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Protection Doesn't Happen Immediately How long until the flu vaccine is effective can vary from person to person, but generally it takes two weeks after vaccination for the body to develop antibodies that provide protection against flu viruses. This is why it's important to not delay immunization.
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The MMR vaccine is very safe, and it is effective at preventing measles, mumps, and rubella. Vaccines, like any medicine, can have side effects.
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After the 2009 pandemic, several U.S. studies among 2 through 17-year-olds found that the nasal spray vaccine was effective against influenza B viruses, and was similarly effective against H3N2 viruses as inactivated influenza vaccines, but was less effective than inactivated influenza vaccines against the 2009 ...
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Protection from influenza vaccine is thought to persist for at least 6 months. Protection declines over time because of waning antibody levels and because of changes in circulating influenza viruses from year to year.
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There are also some flu vaccines that protect against three different flu viruses (“trivalent”); an influenza A (H1N1) virus, an influenza A (H3N2) virus, and one influenza B virus. Two of the trivalent vaccines are designed specifically for people 65 and older to create a stronger immune response.
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How long does immunity from influenza vaccine last? Protection from influenza vaccine is thought to persist for at least 6 months. Protection declines over time because of waning antibody levels and because of changes in circulating influenza viruses from year to year.
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When there has been an increased risk, it has consistently been in the range of 1-2 additional GBS cases per million flu vaccine doses administered. Studies suggest that it is more likely that a person will get GBS after getting the flu than after vaccination.
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Across all age groups including children, the flu vaccine prevented 15-52% of flu cases between 2015 - 2020 (see research by Public Health England on the effectiveness of flu vaccines in the 2015-16 season, 2016-17 season, 2017-18 season, 2018-19 season and 2019-20 season).
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High Dose and Adjuvanted Flu Vaccine Side Effects Side effects can include pain, redness or swelling at the injection site, headache, muscle ache and malaise, and typically resolve with 1 to 3 days.
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In the United States routine influenza vaccination is recommended for all persons aged 6 months and over. It takes up to two weeks after vaccination for sufficient antibodies to develop in the body.
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Several studies have shown that FluMist may actually work better than a flu shot. One that compared the two concluded that "live attenuated influenza vaccine was a safe and more effective alternative to inactivated vaccine."
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Getting an influenza vaccine — though not 100% effective — is the best way to prevent the misery of the flu and its complications. The Centers for Disease Control and Prevention (CDC) recommends that everyone 6 months of age or older be vaccinated annually against influenza.
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This year (2019-20) it's routinely being offered to all children aged 2 and 3 (on 31 August 2019), plus all children in primary school. All children with a health condition that puts them at greater risk from flu should have a flu vaccination every year from the age of 6 months onwards.
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Some people experience soreness or swelling at the site of the flu shot injection. And some have mild side effects like a headache, cough, body aches, or fever. These usually clear up in about one to two days.