Our paper (@isjinpan @ajprussin Duggal lab) on SARS-CoV-2 on surfaces and HVAC filters in dorm rooms housing infected students is now published pubs.acs.org/doi/full/10.10… /1
We found RNA on 71% of HVAC filters, 57% of surface samples (faucet handle, doorknob, floor, etc.), 67% of bathroom vent grilles at 10 to 10,000 gc/swabbed area of ~10x10 cm2. /3 
Samples were not culturable, consistent with other studies looking at swabs, the exception maybe being Santarpia's windowsill sample (nature.com/articles/s4159…). We swabbed >6 hr after room was vacated. /4
From HVAC filter samples, we guesstimated virus concentrations in air of ~0.1 to 100 gc/m3. Hope this info can be useful for risk assessments of airborne and fomite transmission. /5
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