Table 2.

Variations in mask and lockdown policies

	Mask policies and their effective dates	Lockdown policies and their effective dates
Belgium	4/5/2020: mandatory face masks on public transport for everyone > 12 years [31]	18/3/2020: police-enforced general lockdown; essential errands only [16]
Brazil	22/4/20: face masks required in public in certain cities [34]	8/4/20: statewide quarantine [16]
Italy	6/4/20: masks compulsory when one goes outside (residents of Lombardy) [35]	8/3/2020: general lockdown across components of everyday life; businesses can operate if they implement safety measures [16]
United States	3/4/20: CDC recommends masks in public [32]	Lockdown dates varied by state; earliest lockdowns in CA on 19/3/2020, and NY 22/on 3/2020 [39]