Japanese researchers showed that masks can offer protection from airborne coronavirus particles, but even professional-grade coverings can’t eliminate contagion risk entirely.
Scientists at the University of Tokyo built a secure chamber with mannequin heads facing each other. One head, fitted with a nebulizer, simulated coughing and expelled actual coronavirus particles. The other mimicked natural breathing, with a collection chamber for viruses coming through the airway.
A cotton mask reduced viral uptake by the receiver head by up to 40% compared to no mask. An N95 mask, used by medical professionals, blocked up to 90%. However, even when the N95 was fitted to the face with tape, some virus particles still sneaked in.
When a mask was attached to the coughing head, cotton and surgical masks blocked more than 50% of the virus transmission.