Many of the vaccines developed to protect against COVID-19 are forms of messenger RNA (mRNA) vaccines.
The Moderna and Pfizer/BioNTech vaccines are forms of mRNA vaccine.
Unlike the Pfizer/BioNTech and Moderna coronavirus vaccines, the Oxford/AstraZeneca vaccine is not an mRNA vaccine.
Instead, the AstraZeneca vaccine is a viral vector vaccine made from a weakened form of a common cold virus from chimpanzees.
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