How we use and wear face masks can have a dramatic effect on their efficacy in slowing the spread of COVID-19.
source https://www.smh.com.au/national/double-masking-is-our-secret-weapon-against-delta-20210830-p58nbu.html?ref=rss&utm_medium=rss&utm_source=rss_feed
source https://www.smh.com.au/national/double-masking-is-our-secret-weapon-against-delta-20210830-p58nbu.html?ref=rss&utm_medium=rss&utm_source=rss_feed
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