The important thing to remember is that (outside of a trial) REPORTED side-effects are common. Side-effects LINKED TO THE VACCINE are much less sohttps://twitter.com/DoctorChristian/status/1334221833952956418 …
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It's just the law of large numbers at work. If enough people are given a vaccine, sooner or later one of them will be, say, hit by a car shortly after The question is whether this is related to the vaccine or not!
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Now, we know that common/minor things, like headaches, probably are We've excluded common/severe things, like heart attacks, in the trials But what about rare/severe?
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Well, we've tested enough people that even rare/severe things are extremely unlikely. But there will almost certainly be very rare side-effects that can't be captured even with 10,000s of people
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If something only happens 1 in a million times, it's hard to pick it up in even the biggest trial What this means is that there will be some issues that we only find out about once the vaccine has been rolled out
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This is what Phase 4 (post-license) studies are all about. To sort out whether the things that happen to people after getting vaccinated are related to the vaccine or not
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End of conversation
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