This article originally appeared on BeMedWise. An up-to-date version can be found here. Omicron BA.1 has had a major impact on the COVID-19 pandemic. Due to the multiple differences from the Delta variant, the Omicron variant has prolonged and intensified the pandemic, made COVID more difficult to treat, and reduced the effectiveness of currently available coronavirus vaccines and infections from previous variants to prevent further spreading and disease. A new Omicron variant, BA.2, has now entered the picture, although its impact on the epidemic is as yet unknown. The good news is that both Omicron variants are generally milder illnesses. […]