Note about flu vaccines: the annual flu vaccine is actually a concoction of multiple vaccines. Each year a panel of doctors meet and essentially make a best guess at which strains of the virus are going to make their rounds in any given years. They make their decision and throw together a blended vaccine that is supposed to have the broadest and robust coverage for that flu season. Sometimes they get it right, sometimes not. Also, a body will stop making antibodies for specific viruses overtime unless it is exposed to the virus again. That’s why the flu vaccine is an annual thing.
Note about flu vaccines: the annual flu vaccine is actually a concoction of multiple vaccines. Each year a panel of doctors meet and essentially make a best guess at which strains of the virus are going to make their rounds in any given years. They make their decision and throw together a blended vaccine that is supposed to have the broadest and robust coverage for that flu season. Sometimes they get it right, sometimes not. Also, a body will stop making antibodies for specific viruses overtime unless it is exposed to the virus again. That’s why the flu vaccine is an annual thing.
So you could just as well get yourself naturally immune through infection, instead of injecting yourself with god knows what side effects it has.