re: Johnson & Johnson 1 shot vaccine shows 66% efficacy, 85% v severe disease

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I haven't heard that at all. In fact I have read the opposite. No difference in effectiveness.

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I think that effectiveness was based off laboratory settings. I think the idea is that the "in the wild" effectiveness for Pifzer and Moderna is actually lower (still great) and so effectiveness against variants would just be at that same level.