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U.S. flu vaccine effectiveness networks. CDC has been working with researchers at universities and hospitals since the 2003-2004 flu season to estimate how well flu vaccines work through observational studies using laboratory-confirmed flu as the outcome.
Vaccine effectiveness. Influenza (flu) vaccine effectiveness (VE) can vary. The protection provided by a flu vaccine varies from season to season and depends in part on the age and health status of the person getting the vaccine and the similarity or "match" between the viruses in the vaccine and those in circulation.
Less than half of Americans plan to get COVID or flu vaccines this year, survey finds 01:30. The effectiveness of this year's influenza vaccine was lower in South America than last season, the ...
Oct. 4, 2024 – The CDC says the influenza vaccine being used this flu season might be less effective than the one used last flu season, based on reports of how well the vaccine is working in ...
The vaccine’s effectiveness during that year was an abysmal 29%, according to the CDC. But a 2020 study found the shot still prevented an estimated 4.4 million infections, 58,000 ...
Scientists continue to study and learn more about how a person's flu vaccine history affect vaccine effectiveness. Studies have shown that previous flu vaccinations or infections can affect the immune response to flu vaccination in variable ways.
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 annual flu vaccination for everyone age 6 months or older.
In 2017–2018, a study using Medicare administrative data found cell-culture-based IIV (ccIIV) was modestly more effective against influenza-related office visits (relative VE 11%, 95% confidence interval [CI] 8%–14%) and influenza-related hospitalizations (relative VE 10%, 95% CI 7%–13%) than standard IIV among adults aged ≥65 yr ...
Estimates show vaccines this season were between 52% and 61% effective in protecting children against influenza hospitalization. In adults, the shots were estimated to be 41% to 44% effective.
1. Introduction. Influenza is a respiratory disease resulting from infection with the influenza virus. It is more prevalent during cold periods, with the peak of infections between November and April in the Northern Hemisphere and between June and October in the Southern Hemisphere.