Infection trends shifted dramatically when mask-wearing rules were
implemented on April 6 in northern Italy and April 17 in New York City –
at the time among the hardest hit areas of the world by the health
crisis.
Infection trends shifted dramatically when mask-wearing rules were
implemented on April 6 in northern Italy and April 17 in New York City –
at the time among the hardest hit areas of the world by the health
crisis.