Covid-19 Vaccine Job Aid: Why are there extra doses of vaccine in the vaccine vial?

In multi-dose vials, there can be a difference between the number of doses stated on the vaccine label and the true number of doses that can be withdrawn. The true number of doses available from a multi-dose vial will depend on several factors such as syringe dead space, vial overfill volume, and technique and accuracy of doses withdrawn and delivered. More details in this document.

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