CDC:
Any currently FDA-authorized COVID-19 vaccine can be used when indicated; ACIP does not state a product preference. However, COVID-19 vaccines are not interchangeable.
mRNA COVID-19 vaccines (Pfizer-BioNTech and Moderna)
The safety and efficacy of a mixed-product series have not been evaluated. Both doses of the series should be completed with the same product.
In rare circumstances, it's OK for people to receive one shot of Pfizer's Covid-19 vaccine and one shot of Moderna's vaccine at least 28 days apart, the CDC said in updated guidance.
The agency says the two products are not interchangeable.
The CDC acknowledged that it hadn't yet studied whether its new recommendations would change the safety or effectiveness of either vaccine
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