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Can COVID-19 vaccines be mixed and blended?

Can COVID-19 vaccines be mixed and blended?

Health officials say both doses must be from the same vaccine.

The COVID-19 vaccines, currently released in the United States, the United Kingdom and other parts of the world, require two shots several weeks apart.

In the United States, where Pfizer and Moderna vaccines are distributed, health officials say the vaccines are not interchangeable. In England, where photos of Pfizer and AstraZeneca are available, officials also say the doses should be consistent.

But in rare cases, when the same species is not available or if it is not known what was given for the first shot, the British authorities say that it is good to give any vaccine for the second shot. Because Pfizer and AstraZeneca vaccines work in a similar way, they say that an inadequate dose is better than partial protection.

But without any research, the doses of the vaccine should not be mixed, said Naor Bar-Zeev, a vaccine expert at Johns Hopkins University.

If people accidentally get a different vaccine for their second shot by accident, Bar-Zeev said it would probably “work well and be well tolerated,”

; but evidence is needed to be sure.

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