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Year to year, the effectiveness of flu vaccines depends on the similarity of the vaccine viruses to the circulating virus,” says Dr. Minji Kang, MD, an infectious disease expert at UT Southwestern.
Early estimates suggest the flu vaccine performed well in a U.S. winter flu season that has already dissipated. The vaccines were more than 40% effective in preventing adults from getting sick ...
During the 2023-2024 flu season, the vaccine was 42% effective at preventing the flu, according to CDC data. The season before that, it was 30% effective. The most effective the flu vaccine has ...
The effectiveness of seasonal flu vaccines varies significantly, with an estimated average efficacy of 50–60% against symptomatic disease, [91] depending on vaccine strain, age, prior immunity, and immune function, so vaccinated people can still contract influenza. [92]
The vaccine produces a greater immune response than standard vaccine. According to the CDC, [1] "a study published in the New England Journal of Medicine [25] [in August, 2014] indicated that the high-dose vaccine was 24.2% more effective in preventing flu in adults 65 years of age and older relative to a standard-dose vaccine." The CDC ...
FluMist was initially priced higher than the injectable vaccines, but sold only 500,000 of the four million doses it produced its first year on the market, despite a comparative shortage of flu vaccine in fall 2004. [22] The price was sharply lowered the next year, and the company reported distributing 1.6 million doses in 2005. [23]
The Centers for Disease Control and Prevention reported Thursday that the overall effectiveness of the shot in the current flu season is 45 percent.
In another randomized clinical trial conducted in 2014- 2015, the effectiveness of the recombinant vaccine and egg-based inactivated flu vaccine was compared in a population aged 50 or above. In contrast with the egg-based vaccine, the recombinant flu vaccine significantly reduced the risk of influenza-like illness by 30%. [13]
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