Updated Nov 30 2021   Source: Tracking SARS-CoV-2 variants (who.int)     Working definition: A SARS-CoV-2 variant that meets the definition of a VOI (see below) and, through a comparative assessment, has been demonstrated to be associated with one or more of the following changes at a degree of global public health significance:  Increase in transmissibility or detrimental change in COVID-19 epidemiology; OR Increase in virulence or c