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A high-dose vaccine (Fluzone High-Dose) four times the strength of standard flu vaccine was approved by the FDA in 2009. [22] [23] [24] This vaccine is intended for people 65 and over, who typically have weakened immune response due to normal aging. The vaccine produces a greater immune response than standard vaccine.
Influenza vaccines, colloquially known as flu shots [14] or the flu jab, [15] are vaccines that protect against infection by influenza viruses. [ 16 ] [ 17 ] New versions of the vaccines are developed twice a year, as the influenza virus rapidly changes. [ 16 ]
H5N1 continually mutates, meaning vaccines based on current samples of avian H5N1 cannot be depended upon to work in the case of a future pandemic of H5N1. While there can be some cross-protection against related flu strains, the best protection would be from a vaccine specifically produced for any future pandemic flu virus strain.
The exact efficacy varies by year, but data from the Centers for Disease Control and Prevention (CDC) show that for all flu vaccines (meaning nasal and the shot) the 2023-2024 flu vaccine was 42% ...
The flu shot does more than protect you from a more severe case of the virus. It helps others, too, such as newborns too young to receive the vaccine. ... "Neither the current flu or COVID ...
For more than a decade, flu shots in the U.S. also protected against a fourth strain of influenza B, but that strain hasn’t circulated since March 2020, so the Food and Drug Administration’s ...
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