On 11 March 2020, the World Health Organisation (WHO) qualified the Covid-19 virus, which originated in China in December 2019, as a pandemic, since on that date it had circulated across all continents and to the vast majority of countries worldwide.
Since January 2020, some countries have experienced a favourable trend (concomitantly recording a slowdown in new infections, a continuous increase in recoveries and a decrease in deaths linked to the disease), whilst others are still struggling to control the propagation of the virus and its negative consequences on the lives of the sick.
It seemed necessary, therefore, to build a synthetic index, which summarises the respective performances of countries in their strategy for fighting the virus. This index will make it possible at any time, to instantly estimate the severity of the pandemic in different countries. The index is calculated on a weekly frequency for 169 countries.