NIH Mix and Match Study Suggests mRNA COVID Vaccines May Offer Stronger Boost Than J&J
Though not designed to facilitate inter-group comparisons, a preprint study of heterologous and homologous boosting with the three US available COVID-19 vaccines indicate Johnson and Johnson primary vaccines may get greater protection from an mRNA booster.
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After US FDA authorization for additional COVID vaccine shots, the focus now shifts to CDC’s advisory committee, which may be concerned about variations in eligible populations, timing and dosing when it comes to giving a booster different from the primary vaccination series.
Discussion also reopened the debate on allowing universal boosting with mRNA vaccines, with advisors giving FDA more leeway to allow some younger Americans to get an additional mRNA shot regardless of their occupation or underlying health conditions.
Despite lack of enthusiasm with immunobridging study data, the panel endorsed emergency use in certain at-risk populations, in part because it would be hard to turn down the Moderna booster when an identical EUA had been issued for Pfizer/BioNTech's mRNA vaccine.