Bivalent COVID-19 mRNA booster vaccination (BA.1 or BA.4/BA.5) increases neutralization of matched Omicron variants. - Springer DN; Bauer M; Medits I; Camp JV; Aberle SW; Burtscher C; Höltl E; Weseslindtner L; Stiasny K; Aberle JH (NPJ vaccines, 2023)