During the coronavirus disease 2019 (Covid-19) pandemic, the emergence of the BA.1, BA.2, and BA.3 sublineages of the B.1.1.529 (omicron) variant of severe acute respiratory syndrome coronavirus 2 ...

The neutralizing activity of all serum samples was tested against the B.1.429 variant and a variant of concern that first emerged in South Africa (B.1.351, also called 20H/501Y.V2). We compared this ...