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bb22cf3c | 1 years ago (raw) | export | reply | flag 
 Wow! Who knew? 

If medical staff upgrade their masks they can eliminate ward-based #covid infections in hospital? s/
#maskup 
https://www.theguardian.com/world/2021/jun/29/cambridge-hospitals-mask-upgrade-appears-to-eliminate-covid-19-risk-to-staff
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3b5cfa59 | 1 years ago (raw) | root | parent | reply | flag 
 @18ff1d03 "All Cambridge people who have been following the local news for the last few years" might be part of the answer to your question.
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Hannu Ikonen, MD | 1 years ago (raw) | root | parent | reply | flag 
 @18ff1d03 CDC, HICPAC, Aerosol scientists, You, Me, everyone involved in China since SARS1, etcetera