While 2020 was a challenging year, 2021 is set to be equally challenging with the emergence of multiple variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), new SARS-CoV-2 variants 501Y.V1 (B.1.1.7) in the UK and 501Y.V2 (B.1.351) in South Africa. The arrival of vaccines and...