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If it's a social construct, then it can't have a biological impact on the efficacy of a vaccine.

You see the paradox?

Why not? Money is a social contruct, but dollars to donuts, populations with less of it will have lower vaccine efficacy.

You're right. That would be a counter-example because of non-biological second-order effects.

But in this context, we're talking about first-order biological effects that aren't accounted for because of race. If race doesn't have biological underpinnings then the larger argument is meaningless.

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