Dear Kidanemariam Gebregziabher Gebrehiwot,

Such an indicator could be burdened with a high level of error of correlation between the issue of the scale of development of the SARS-CoV-2 (Covid-19) coronavirus pandemic and the level of international tourist traffic, cross-border business trips and others. The inaccuracy of this type of indicator results from the fact that, apart from the issue of international tourism, there are many other factors determining the scale and pace of the development of successive waves of the SARS-CoV-2 (Covid-19) coronavirus pandemic in individual countries. For example, the level of general public awareness of the principles of compliance with anti-pandemic safety instruments (e.g. wearing protective masks, maintaining social distancing in public places and frequent washing and / or disinfecting hands with disinfectant fluids) and the sense of social solidarity between generations varies from country to country. In addition, there are also significant differences between countries with regard to the commencing or ongoing vaccination programs of citizens against the coronavirus SARS-CoV-2 (Covid-19). There are also significant differences between countries in terms of the imposed anti-pandemic security restrictions, lockdowns imposed on specific industries and sectors, and improvement of crisis management systems and pandemic risk management. Therefore, there are many additional determinants shaping the different level and scale of the development of the SARS-CoV-2 (Covid-19) coronavirus pandemic in individual countries.

Best regards, Have a nice day, Stay healthy!

Dariusz Prokopowicz