It should not be needed for the mRNA vaccines though.
The components other than mRNA are almost certainly synthesized and not biological.
As for the mRNA, it is made using T7 RNA polymerase (an enzyme derived from a virus) and rNTP’s. In meetings with both Pfizer and Moderna they have stated they absolutely require animal origin free certification for both of those.
I read they used animal cells in research but no idea what or how accurate that is.
Edit:
I found this which states cow milk is the only animal product used in the early manufacturing stage:
https://www.nottsapc.nhs.uk/media/1642/covidvaccinefaqspfizer.pdf
Does the COVID-19 vaccine contain any animal derivatives?
The manufacturer provides the following information:
• A material used in the early stage of the manufacturing process contains a component that is derived from bovine milk. The bovine milk is fit for human consumption and complies with bovine spongiform encephalopathy (BSE)/transmissible spongiform encephalopathies (TSE) regulations.
• Other raw materials used in the manufacture of the vaccine are of non-animal origin.
• All lipid excipients used in the vaccine are either from plant-derived sources or are synthetic and have no animal components.
• The manufacturer cannot guarantee that minute amounts of substances are not contained in raw materials obtained from their suppliers.
The manufacturer states that animal or human cell lines are not used in the manufacturing process of the Pfizer COVID-19 vaccine.
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