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To cope with the pandemic, many people have recently adopted face masks – transparent plastic protection for the entire face – and masks with valves that filter the air intake, because they understand that they are safer. But a study published yesterday in the Florida Atlantic University journal Physics of Fluids indicates that traditional masks are more efficient.
Sneeze and cough simulations, performed in the laboratory, show that the face shield blocks secretions, but the droplets easily pass under the visor and spread over a large area.
Siddhartha Verma, author of the study, warns that “potentially, it can cause contamination”. “Our focus was on the smallest droplets, because they can stay in suspension for a long time and can contain enough virus particles to transmit disease,” Verma added.
Finally, research suggests that to minimize the spread of COVID-19, it is preferable to wear traditional surgical tissue masks, rather than face shields or valve masks.
The information is from the newspaper O Estado de S. Paulo.
