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therealdannyking t1_izp63cd wrote

A year is considered "long term" when talking about vaccines (https://www.bbc.com/news/health-60468900).

mRNA vaccines have been used in oncology for almost a decade with no long term side effects seen.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7956899/

https://clinicaltrials.gov/ct2/show/NCT01684241

In addition, billions of doses have been given so far, so any long-term side effect must be less than one in a billion if it hasn't cropped up yet.

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