The virus that causes COVID-19 (called SARS-CoV-2), like other viruses, can mutate and has mutated multiple times since the pandemic first began in late 2019. Those mutations or changes in its structure have created what’s referred to as variants.
It’s common for virus variants to develop, with some of them being more concerning than others. For example, a variant that moves from one person to another more easily creates a higher risk of infection.
What’s known as the Delta variant (B.1.614.2) is one such “variant of concern” or VOC. First appearing in late 2020, it’s now found in populations all around the world and is the dominant strain of COVID-19 in many countries.
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