April 9, 2020

Effectiveness of surgical, cotton masks in blocking SARS-CoV-2

Editor's Note

In this study from Seoul, South Korea, both surgical and cotton masks were ineffective in preventing the dissemination of SARS-CoV-2, from coughs of patients with COVID-19 to the environment and external mask surface.

For the study, four patients with COVID-19 were admitted to negative pressure isolation rooms and asked to cough five times onto a petri dish while wearing the following sequence of masks: no mask, surgical mask, cotton mask, and no mask.

Median viral loads of nasopharyngeal and saliva samples from the four participants were 5.66 and 4.00 log copies/mL, respectively.

Median viral loads after coughs without a mask, with a surgical mask, and with a cotton mask were 2.56, 2.42, and 1.85 log copies/mL, respectively.

All swabs from the outer mask surfaces were positive for SARS-CoV-2, and most swabs from the inner mask surfaces were negative.

These observations support the importance of hand hygiene after touching the outer surface of masks, the researchers say.


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