I find it hard to believe they haven't covered this with their phrase 3 trials, where the intent is to ensure that there is no risk at broad scale (in addition to effectiveness), and they pause the trial if anyone dies for unknown reason (etc) -- I definitely remember the trials pausing briefly while they investigated[1], and then continuing once resolved.
I also saw a study a few weeks ago where they found people with antibodies 6-8 months later[2][3]. Suggesting longer term immunity.
I find it hard to believe they haven't covered this with their phrase 3 trials, where the intent is to ensure that there is no risk at broad scale (in addition to effectiveness), and they pause the trial if anyone dies for unknown reason (etc) -- I definitely remember the trials pausing briefly while they investigated[1], and then continuing once resolved.
I also saw a study a few weeks ago where they found people with antibodies 6-8 months later[2][3]. Suggesting longer term immunity.
[1]: https://www.nytimes.com/2020/10/14/health/covid-clinical-tri... [2}: https://www.sciencealert.com/evidence-grows-favouring-corona... [3]: https://www.businessinsider.com/long-term-coronavirus-immuni...