re: What purposes does the vaccine serve for people that have beaten covid?

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I would think your body fighting the actual virus would produce better immunity than getting a shot of the watered down virus. That being said, I'm nowhere close to a healthcare related field

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Not sure it’s completely understood, but infectious inoculation dose may be playing a large part here. Perfect example: moderna is being shown to be better than Pfizer against delta variant despite being almost identical. Possible / likely reason? Moderna is simply a bigger inoculation.