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I think the "code" of the vaccines is pretty much open. It is the production line, that is complicated and hard to set up, if you want to achieve some quality vaccines.

China had an unfortunate event where people were poorly reverse engineering baby formula so they poisoned a bunch of their own kids.

People in China are still posted about that.

>i do wonder how easy/hard it really is to reverse engineer a vaccine

I think it's easier to gain this information via hacking and data theft or paying insiders for documents than actually reversing the vaccine.