💥 Very important finding: Airborne infectivity of SARS2 🦠 decreases by ~90% within 20 min. The group hasn’t yet tested #Omicron —but overall, this work underscores that crowding indoors drives the pandemic. 🧵 #COVIDisAirborne cc: @EricTopol medrxiv.org/content/10.110…
“We report changes in the infectivity of the airborne virus over timescales spanning from 5 s to 20 minutes and demonstrate the role of two microphysical processes in this infectivity loss: particle crystallisation and aerosol droplet pH change.”
“A decrease in infectivity to ~10 % of the starting value was observable for SARS-CoV-2 over 20 mi, w/ a large proportion of the loss occurring within the first 5 min after aerosolisation.”
..@guardian covers the work here theguardian.com/world/2022/jan…
I’ll add that the methods the group used are quite elegant. “Controlled Electrodynamic Levitation and Extraction of Bioaerosols onto a Substrate” They suspend the aerosol in a chamber and applied it to permissive cells at different times. cc: @carlzimmer 
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