Thanks. I didn't know that they've started to backpedal. As for sources I had no idea it was such a controversial topic and something I thought was obvious (again, my point was just that an inefficient mask could be counterproductive) but here's the European Centre for Disease Prevention and Control saying the same thing:

> There is a risk that improper removal of the face mask, handling of a contaminated face mask or an increased tendency to touch the face while wearing a face mask by healthy persons might actually increase the risk of transmission.

https://www.ecdc.europa.eu/sites/default/files/documents/COV...