Table 1. Test countries, with measures implemented.

Country	Measures	Param. involved	Starting Date	Population (rounded)
Austria (AT)	Partial lockdown	μ, ρ	16 Mar	9,000,000
	Social distancing	ρ, μ	16 Mar
	Contact tracing	χ	16 Mar
	Phase-out		Around 14 April
Denmark (DK)	Social distancing	ρ, μ	13 Mar	6,000,000
	Mild surveillance	η	13 Mar
	Phase-out		14 Apr
Ireland (IR)	Partial lockdown	μ, ρ	28 Mar	5,000,000
	Social distancing	ρ, μ	13 Mar
	Phase-out		18 May
Israel (IL)	Partial lockdown	μ, ρ	15 Mar	9,000,000
	Social distancing	ρ, μ	15 Mar
	Contact tracing	χ	15 Mar
	Phase-out		19 April
Lombardy (LO)	Lockdown	μ, ρ	13 Mar (Italian)	10,000,000
	Social distancing	ρ, μ	13 Mar
	Phase-out		Around 15 Apr
Switzerland (CH)	Lockdown	μ, ρ	16 Mar	8,500,000
	Social distancing	ρ, μ	16 Mar
	Phase-out		27 Apr

Test countries, with corresponding implemented measures (following the ACAPS database [24]), parameters in our SPQEIR model, starting date and rounded population of each country. For Lombardy, we used the Italian official date for lockdown. Ireland issued measures on two different dates; we use this case to compare social distancing and lockdown effect in a single country. We assume that the parameter η is associated to all countries, which worked to isolate contagious individuals.