The US Food and Drug Administration’s emergency use authorization of Moderna, Inc. and Janssen Biotech Inc. COVID-19 vaccine booster doses, as well as heterologous “mix and match” booster strategies for the three currently available vaccines, will add further complexity to immunization recommendations that already vary by product, eligible population and dose.
On 20 October, the agency authorized a single booster dose for Moderna’s mRNA vaccine in three high-risk groups at least...
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