I've noticed that when someone tries to look for the virus outside the humans' bodies they can't find any serious quantaty or massive signature.
Even in the hospitals (frontline) of China doctors had used PCR and found almost nothing:
Preprint Aerodynamic Characteristics and RNA Concentration of SARS-Co...
Due to method used!
My expectation is that the PCR is incomplite test if we speak about finding of the virus (virions of COVID-19 are enveloped by the proteins!) in external environment. We should use deatached procedures and then SDS-Page analysis which will detect the exact protein signature of COVID-19.
I'll be happy to collaborate with those who wish to work on this topics. I've got more materials to share.
In fact we have airborne transmission according to genetical, geographical and statistical data (please see the slide enclosed).