The vaccine doses are already being mixed. Meaning a person may have Pfizer for first dose, then Moderna for second dose. Why is this happening? So far two prominent reasons. One the patient lost their card, and doesn’t remember which vaccine they received, or went to a different site for second dose, due to availability.
Other issue the freezer stopped working, (Pfizer) and the facility gave all vaccine before it expired, next vaccine shipment, was Moderna
Since there were no studies for a mix, and probably won’t be. The CDC did make a quick statement that a mix should not be a problem, if mixing vaccine doses did happen.
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