The Omicron variant of COVID-19 burst on the scene very quickly in the United States and around the world. Here’s what we know about this variant from the growing body of scientific research, including the ways it is both similar and different to other COVID-19 variants. What is the Omicron Variant? The Omicron COVID-19 variant is one of four current “variants of concern” named by the World Health Organization. It was first detected by scientists in South Africa and Botswana in November 2021,...