Was tried earlier today with a text as the source. Text was from “someone who works at a water treatment plant”. Claimed people going back to work to buildings that had been empty would get everyone sick. Could happen, perhaps. But hotels go through high/low seasons where there is little to no water movement in the building. Other potential causes as well in the link. Here’s a cdc sheet on it for your discretion. https://www.cdc.gov/legionella/downloads/toolkit.pdf
Schools do that every summer. And many schools have already been back for weeks with no reports.
>2019