A single study generally isn't conclusive, especially in a field with as many confounding factors as public health policies. It'll take a lot of time and hard

A single study generally isn't conclusive, especially in a field with as many confounding factors as public health policies. It'll take a lot of time and hard work to decisively say if there's an effect and to what degree. The various studies and meta-analysis I've read appear to indicate that masks somewhat slowed the transmission rate, but overall didn't greatly reduce final case counts. There's enough uncertainty that I believe we'll need solid RCTs to get better answers. There was on large RCT slated to happen in west African country (Rwanda maybe?) where covid-19 hadn't hit.