Today I was told that the Pfizer-BioNTech vaccine (now approved for use in the US, UK, & Canada) is a virus (screencap at the bottom of this thread). It really isn’t, but I’ve seen this one several times & so I think it’s worth unpacking a little further. (You can also read about mRNA vaccines here, here, & here, for example.)
This is a companion discussion topic for the original entry at https://sciblogs.co.nz/bioblog/2020/12/13/vaccines-viruses-mrna/