As noted in the bright yellow box at the top of the page, this is an unreviewed, and as you note unreplicated, preprint. Don't place too much weight on it. Als

As noted in the bright yellow box at the top of the page, this is an unreviewed, and as you note unreplicated, preprint. Don't place too much weight on it. Also note that it describes aerosol concentrations as "undetectable" in the patient-use areas where samples were collected.