So not a surprise but more good data about how critical masks are in spreading the spread of the virus. I have seen purposeful misinformation from anti-maskers saying masks don’t protect you from getting it. Again to be clear they are meant to PREVENT spread, not to protect the wearer. So if EVERYONE wore masks it would work brilliantly. Excerpt from Guardian below:
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Face masks lower the risk of spreading large Covid-linked droplets when speaking or coughing by up to 99.9%, a lab experiment with mechanical mannequins and human subjects has found.
A woman standing 2 metres from a coughing man without a mask will be exposed to 10,000 times more large droplets than if he were wearing one, even if he were then only 50cm away, researchers reported in the journal Royal Society Open Science.
The study focused on particles larger than 170 microns in diameter, which are understood to be the main driver of Sars-CoV-2 transmission.
“There is no more doubt whatsoever that face masks can dramatically reduce the dispersion of potentially virus-laden droplets,” senior author Ignazio Maria Viola, an expert in applied fluid dynamics at the University of Edinburgh’s School of Engineering, told AFP.
According to the Institute for Health Metrics and Evaluation (IHME) in Seattle, Washington, 55,000 lives could be saved in the United States over the next four months if a policy of universal mask use were adopted.
The WHO updated its Covid-19 guidance earlier this month to recommend masks be worn indoors in the presence of other people if ventilation is inadequate.