‘Only those with plastic visors were infected’: Swiss government warns against face shields

Vetenskapsforum Covid-19 har lagt ut denna länk. Enbart visir ger noll skydd. Visir är bara ett komplement (och inget alternativ!!) till munskydd:

https://www.thelocal.ch/20200715/only-those-with-plastic-visors-were-infected-swiss-government-warns-against-face-shields