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Honestly, I think a "mix" of the regular with mRNA gives a better immune response. The UK was doing a study on this to compare Pfizer first, AZ second, AZ first, Pfizer second, then comparing them to All AZ an All Pfizer.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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