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Vaccines contain “active ingredients”. This usually refers to either “killed” (inactivated) whole virus, or components of a target virus (known as “attenuated” vaccine). There’s a new vaccine type, called mRNA vaccines. But they have the same objective: give them through a shot in the arm (intramuscular) and trigger our body’s immune response to antigens viruses, bacteria and other pathogens, or parts of them.
To manufacture vaccines in a safe and effective way, and in order for them to work well, it’s important that they also contain other key ingredients. These are also known as excipients . With the current pandemic, the role of vaccines has come to the fore. We explore some numbers: