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there are so many strains of COVID-19 that I doubt a single vaccine can protect against all of them

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

Copyright 2017 David Spragg