Covid-19 Case Statistics in Europe Show Moderate Negative Correlation with Vaccination Level

Based on the statistics of Covid-19 cases and vaccination level in the last quarter of 2021, a moderate negative correlation was detected between the level of vaccination and current and peak case numbers in a number of European health jurisdictions. Statistically significant correlation was detected after taking into account differences in the local phase of the cases curve, by comparing statistics at the similar phase such as near the top of a local wave rather than current. These results may indicate a certain level of effectiveness of vaccines in preventing Covid-19 spread in the population, though analysis of other factors is still needed for a confident conclusion.