All viruses change over time. We all know that the SARS-CoV-2 virus, which causes COVID-19, has had quite a few variants since it first emerged in 2020. These changes affect different properties of the virus, such as the how easily it spreads, the associated diseases’ severity and even the performance of vaccines. So far, five variants have been detected, including Omicron. The current dominant variant (the most widespread) is Delta. Reducing transmission through proven methods,…