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Old 09-23-2021, 11:06 AM   #6
John Mercier
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https://www.cdc.gov/media/releases/2...rotection.html

The breakthrough most likely acted like a booster shot to the initial vaccine.
It reinvigorated the immune system... much like a booster would.

I think only a blood test could determine the actual level of protection that each of us has at any given time; and even that would be a bit subjective.
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