BALTIMORE (WJZ) — Workers have again gotten sick at Johns Hopkins’ Keswick location.

This is the third time in several weeks that workers have gotten sick. Four people became sick this week. In at least three of those four cases, there is no connection to the illnesses caused two weeks ago.

The hot water heater that was the cause of the original problem has been replaced and the water system has been flushed repeatedly. Even so, the restrooms and kitchenettes served by that portion of the water system are closed to use and will remain so until the state performs tests. There’s no set date for when that will be.

There’s no word on the cause of this latest illness.