The problem with "reliable sources" in this context is there is so much legitimate looking disinformation out there. Unless one is already suspect of them, they won't necessarily be looking for it and will get caught in the trap. I am also a researcher in a related field of study to the vaccines (bio-nanotechnology). If I wasn't spending way too much of my life looking into this stuff, I would not appreciate the extent of the misdirection, both on the public and on researchers.
I recommend your niece look at previous coronavirus vaccines to get a better idea of the problems encountered there that have not been studied in these vaccines.
This link is just to google scholar. Any peer review database will work just as well. The key is to look before 2019 (as this link does). Many papers published after that are full of disinformation intended (or unintended) to mislead.
The problem with "reliable sources" in this context is there is so much legitimate looking disinformation out there. Unless one is already suspect of them, they won't necessarily be looking for it and will get caught in the trap. I am also a researcher in a related field of study to the vaccines (bio-nanotechnology). If I wasn't spending way too much of my life looking into this stuff, I would not appreciate the extent of the misdirection, both on the public and on researchers.
I recommend your niece look at previous coronavirus vaccines to get a better idea of the problems encountered there that have not been studied in these vaccines.
This link is just to google scholar. Any peer review database will work just as well. The key is to look before 2019 (as this link does). Many papers published after that are full of disinformation intended (or unintended) to mislead.