Before revision:  We apply this method to analyse the evolution of COVID-19 cases and deaths, partitioning data points into an appropriate number of clusters on each day to track both the  total number of clusters and their changing constituency over time .
After revision:  We apply this method to analyse the evolution of COVID-19 cases and deaths, partitioning data points into an appropriate number of clusters on each day to track both the COVID-19 pandemic. On each day, we partition countries into clusters according to both their case and death counts. The total number of clusters and their changing constituency over time .