Q&A: Experts Discuss New COVID-19 Variants and Vaccine Effectiveness
In November 2020, a new variant of COVID-19 was identified in the United Kingdom (B1.1.7). In December 2020, it was announced another variant had been uncovered in South Africa (B1.351). Yet another emerged in January in Brazil, known as P.1. A virus can mutate when it copies itself as it spreads.