“...they are no different than flu vaccines in that regard...”
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There is no such thing as a “flu vaccine”. You can get a “flu shot” which may or may not keep you from contracting the flu. It may also help mitigate the effects of the flu if you contract it, but it is not a vaccine and does not provide you with immunity. A vaccine provides your body with immunity. If it doesn’t, it is NOT a vaccine.
Amen!