This paper reports transmission occurring after 4 hours of vacancy in a room with 6 ACH ventilation measured at some undisclosed time before the outbreak.
There really needed to be some multidisciplinary input to this report, and not accept "6 ACH" at face value. Inspect the equipment. Do a test with tracer aerosols. Anything.
@DavidElfstrom Equally, the infection route could have been something other than aerosols, such as some jointly shared piece of equipment in the room or maybe they were all infected by the same orderly bringing them dinner.
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