The virus mutates faster than you can build a vaccine against it. By the time you field a vaccine, the organism you are protecting against no longer exists. It is extinct. It has been replaced by a new variant. You are vaccinating against an extinct disease, and you are preventing the population from ever achieving herd immunity.
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The miracle is, they seem to have cured the flu. There are just no more fly cases anymore. Truly amazing how this could have happened.
Mate like I've said before, at this point it is an IQ test.
Amen