Masks again, again and again.

The Story of mask evidence, barriers, distancing, hygiene, etc.

Physical interventions to interrupt or reduce the spread of respiratory viruses or (A122 for short) is a Cochrane review of the evidence for the effectiveness and harms of all non-pharmaceutical interventions (NPIs) to halt or delay the spread of respiratory viruses. NPIs are also known as physical interventions, excluding drugs, vaccines and other biol…