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Originally Posted by 1andrew1
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1) The immune system works by eventually stopping production of antibodies, because they are no longer needed. The required antibody is "memorised" and produced, if and when it is needed. Think about it, it would be ridiculously wasteful of the immune system to constantly produce antibodies for something, it's never ever going to need again.
2) Seasonal flu reoccurs because the virus mutates and presents itself as a new virus. Think about it again, if each year it was the same virus, they wouldn't have to come up with a new flu vaccine each year. There would be just one that was used again and again.
3) Even if any vaccine only works for a few months, that should be long enough for the virus to die out. It would be unable to reproduce.
4) If herd immunity wasn't a fact, then people would've still been dying from Spanish Flu for the past 100 years.