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Schematic overview of the processes involved in the dynamic lifecycle of SARS-CoV-2, from (A) virion loading of airborne particulate matter (PM), (B) loading of PM-virion associates (and of unassociated or free virions) into aerosol droplets, (C) the environmental transport of loaded droplets, (D) droplet inhalation, transport to alveoles, release of virions from PM and subsequent specific binding of virions to host cells, and (E) exhalation. See text for further details.
