Companies have to do them. No one is stopping them. But we're talking about commercial products, so can "make" them do anything, unless...
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People thought dexa wouldn’t work and they had perfectly good reasons to think so. Instead, we got 1/3 reduction in mortality in severe disease simply because somebody ran a trial during the initial phase. Potentially front loading/doubling vaccine supply, is not a minor issue.
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The trials for one shot vaccines will have to be several months long to demonstrate equality of one shot to two over a predetermined period of time. Placebo RCT are rapidly coming to an end.
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