I only know what I was told when interviewing at a Bay Area pharma manufacturer to work on bioreactor engineering so I don't have hands-on production line experience, just info on how it generally is done. We separate manufacturing of the substance from packaging of it.

Also, note that vaxes are made by mixing separately produced components, it's not all done on one tank at one time but instead different vendors may make components and the end mfr puts it all together then puts the result in final containers. So the mRNA might be made by one vendor, and other things come from others. It is possible no one vendor of subcomponents knows the full 'secret sauce' formula. They just get orders for a batch of something.

Everything is controlled by FDA regulations and each step is documented for back-traceability.

I only know what I was told when interviewing at a Bay Area pharma manufacturer to work on bioreactor engineering so I don't have hands-on production line experience, just info on how it generally is done. We separate manufacturing of the substance from packaging. Also, note that vaxes are made by mixing separately produced components, it's not all done on one tank at one time but instead different vendors may make components and the end mfr puts it all together then puts the result in final containers. So the mRNA might be made by one vendor, and other things come from others. It is possible no one vendor of subcomponents knows the full 'secret sauce' formula. They just get orders for a batch of something.