A large study run in Bangladesh claimed that surgical masks, but not cloth masks, reduced symptomatic SARS-CoV-2 infections" by 0.08% (ARR), and only in people over 50. But a subsequent re-analysis of the study by statisticians found that there was in fact no benefit at all.

More than eight months into the pandemic, health care leaders are again calling for a coordinated national strategy to distribute personal protective equipment to protect health care workers and their patients as a new wave of disease wells up across most of the country.

Despite not being regulated, there are ways for these brands and their manufacturers to increase their trustworthiness, like FDA registration or inclusion in the FDA's now-defunct emergency use authorization (EUA), which it passed in 2020 to help medical workers choose KN95 masks.

Miller also previously told us that the list of KN95 models the FDA specifically approved in its April 2020 emergency use authorization Bookmarks (such a good point) is one of the best resources to use when sourcing the respirators, even after the FDA stopped updating the list in 2021.