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Johnson & Johnson: Booster dose gets our vaccine to 94% effectiveness

Was the Johnson & Johnson/Janssen vaccine for COVID-19 a two-dose system all along? That certainly seems to be the takeaway from the pharmaceutical’s new data released this morning. The vaccine got developed explicitly to deliver immunity in a single dose, which it did effectively enough by far to pass muster with the FDA, both for an emergency use authorization and eventually full approval.

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