The journey of a vial of vaccine: From shipment to storage to shots in arms, it can be a tricky, meticulous operation

The process of getting doses from the factory to storage and then into arms is a daunting operation, hinging on meticulous handling and preparation protocols. The temperature has to be right. The timing must be exact. Even the method of preparing the injections must be precise, or the dose has to be discarded. Here is how it works.

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