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C-19 shot. How long does it take to build immunity

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NEW: C-19 shot. How long does it take to build immunity
NEW: Interesting !!!
NEW: I was searching for a more official answer ~~~
NEW: "Official" answers
NEW: I can easily understand why 50% of the population
NEW: I don't understand why .....
NEW: Now it's 58% per CNN
NEW: strains
NEW: Exactly... and as with influenza.

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