
As the Covid-19 pandemic has progressed, we’ve repeatedly seen the arrival of new viral variants. Variants of concern, such as Delta and Omicron, are versions of SARS-CoV-2 (the original variant that causes Covid-19), which have acquired mutations. These mutations can provide SARS-CoV-2 with a genetic advantage. For example, Delta is linked to more serious illness than the original variant, while Omicron is more infectious.