I would defer to my public health expert colleagues in that regard.
I do think that it would be important for health care workers to be tested and also to know what their immune status is. If they are immune already, hopefully they are safe within those environments, but there is still very much that is unknown about the coronavirus and how long immunity might last, for example. We are in an experiment in real life now. We have to continue to do these studies right as we're in the middle of it, so yes, I think it's critical to ramp up testing as much as possible.