What is the new variant XE of COVID-19? The Omicron variant of SARS-COV-2 which is responsible for over 90% of all positive cases worldwide has three known sub-lineages: BA.1, BA.2, and BA.3. The BA.1 subvariant was the most prevalent during the initial Omicron wave around the end of 2021. However, the newer BA.2 subvariant has...