An individual can wear a proper mask in the proper manner and be VERY protected from infectious agents.
Effects at a population level, with many uneducated and unmotivated individuals wearing a random assortment of unfitted headgear is MUCH MUCH harder to discern.
Studying disease spread at the level of rigor that this paper anticipates is very difficult, would never get sufficient funding, and would never pass a review board.
Effects at a population level, with many uneducated and unmotivated individuals wearing a random assortment of unfitted headgear is MUCH MUCH harder to discern.
Studying disease spread at the level of rigor that this paper anticipates is very difficult, would never get sufficient funding, and would never pass a review board.