. . Health authorities say the most prevalent weapon to combat Covid - surgical masks - should be discarded after one use, but environmental concerns are leading some scientists to question this recommendation..
. . Public health officials have said masks are necessary to curb the spread of COVID-19, but stringent tests conducted on behalf of CBC's Marketplace found that while some work well, others provide little protection from the particles that transmit the new coronavirus.. One type of mask can spread the particles to others.
To determine what type of mask material is effective at trapping ultrafine particles that may contain viruses such as SARS-CoV-2, a team of researchers tested t-shirts, socks, jeans and vacuum bags in new study
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