Study highlights effectiveness of masks and raises issue with visors in Covid-19 fight скачать в хорошем качестве

Study highlights effectiveness of masks and raises issue with visors in Covid-19 fight

A a lab in the Mater Hospital in Dublin, Professor of Surgery Ronan Cahill and Dr Kevin Nolan have been putting different types of face coverings to the test. Recorded on a high-speed camera, the footage shows the load of droplets expelled from the nose and mouth when wearing and not wearing a covering. The footage shows that when wearing a common surgical mask, the volume of droplets expelled into the air is reduced. Cloth coverings yield a similar result. Professor Ronan Cahill say: "Masks aren't balloons and do they let some gas pass through them. The important thing is that they're cleaning that breath of droplets. So you need to make sure you mask fits around the sides and edges." Questions have been raised about the effectiveness of plastic visors, with Prof Cahill saying that "with the visor an awful lot of the breath is diverted downwards unfiltered and that's important for people to know". He said this was particularly important for "people who are standing above other people, such as those working in a restaurant, cabin crew, hairdressers and possibly teachers." The Mater research also shows that the aerosols and droplets from the nose and mouth can remain suspended in the air - in an inside room with no ventilation - for up to an hour before falling to the ground