The discovery of Legionella bacteria led to closures at some of the Atlanta-based offices for the Centers for Disease Control and Prevention.

Many of the buildings where we lived out our pre-virus days have been largely empty and idle. Now, some experts are warning that stagnant water systems may have become breeding grounds for Legionella.

As claims come in from people affected by a deadly outbreak of Legionella bacteria last July, the Sheraton Atlanta hotel on Wednesday filed a lawsuit in...