Some side effects are extremely rare. A phase 3 trial has 10.000s participants. That is not enough to catch rare events that happen 1 in 100.000 or 1 in 1M. That is why, all medication, is monitored in phase 4: when the vaccine is in use. And yes, that works, the 1/1M
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Marc Veldhoen (marc_veld@mastodon.online)'s status on Sunday, 18-Feb-2024 21:03:36 JSTMarc Veldhoen