Marshal Space flight Center has done the same after an employee tested positive.
The other centers, I suspect, will follow suit in the coming week...
We have been urged to come in tomorrow only if we need to pick up our work laptop or personal items and go back home to tele-work if at all possible.
Its hard to overstate just how badly this impacts missions with tight schedules, but it is critical that this be done on as large a scale as possible. It may well be too little too late, but it must be done.