James

“One 2007 study showed that public health measures such as banning mass gatherings and imposing the wearing of masks collectively cut the death toll in some American cities by up to 50 per cent (the US was much better at imposing such measures than Europe). The timing of the measures was critical, however. They had to be introduced early, and kept in place until after the danger had passed. If they were lifted too soon, the virus was presented with a fresh supply of immunologically naive hosts, and the city experienced a second peak of death.9”
― Laura Spinney, Pale Rider: The Spanish Flu of 1918 and How it Changed the World