“the science on masks is clear: They work. Even experts I spoke with who think harsh lockdowns may have been counterproductive say indoor mask mandates were clearly effective.
“Indoor masking guidance was proven to be effective,” Amesh Adalja, senior scholar at the John Hopkins Center for Health Security, told me. “When you look at it all, I think that is probably going to be the one that shows the most effect. … Most things can be done safely if people socially distance and wear a mask indoors in an unvaccinated setting.”
The available research supports that conclusion. In a study published in March 2021, CDC researchers examined case and death rates at the county level after mask mandates were put into place and found the mandates were associated with slower transmission.”
“An earlier study, published in June 2020 in Health Affairs, had reached the same conclusion. Its authors estimated that mask mandates had averted some 200,000 Covid-19 cases by mid-May; at the time, the US had counted less than 2 million cases, indicating that the mask mandates had a meaningful effect in slowing the virus down early in the pandemic.
Some commentators have questioned why dire warnings about what would happen when Texas lifted its mask mandate for good in March 2021 never materialized. But the mandate’s rollback took place in a very different context from the spring of 2020.
For one, many more people now have protection from the virus, between vaccinations and prior infections. More widespread immunity was already an obstacle for the virus.
But on top of that, because the pandemic has become so politicized, people have already sorted themselves into their different camps, experts indicated — and so a state mandate might not have changed behavior. By now, you are already either a mask-wearer or you’re not. A government mandate probably isn’t going to affect someone’s behavior in June 2021 as much as it would have a year ago, especially after enforcement has been nonexistent.”