Immunogenicity of the BA.1 and BA.4/BA.5 Severe Acute Respiratory Syndrome Coronavirus 2 Bivalent Boosts: Preliminary Results From the COVAIL Randomized Clinical Trial.

Branche, Angela R; Rouphael, Nadine G; Losada, Cecilia; Baden, Lindsey R; Anderson, Evan J; Luetkemeyer, Anne F; Diemert, David J; Winokur, Patricia L et al. · Clin Infect Dis · 2023

rct · Level II

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Abstract

In a randomized clinical trial, we compare early neutralizing antibody responses after boosting with bivalent severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) messenger RNA (mRNA) vaccines based on either BA.1 or BA.4/BA.5 Omicron spike protein combined with wild-type spike. Responses against SARS-CoV-2 variants exhibited the greatest reduction in titers against currently circulating Omicron subvariants for both bivalent vaccines.

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