The world’s most trusted evaluator of medical studies, the Cochrane Database of Systematic Reviews, has just released as close to a conclusive report on the effectiveness of masks against respiratory viruses such as COVID-19 as we are likely to have for the foreseeable future. The report assessed data from 78 different studies, including 11 new randomized controlled trials involving 610,872 participants.

Cochrane concluded, in the words of one of the authors, Dr. Tom Jefferson of Oxford University, “There is just no evidence that they (masks) make any difference. Full stop.”