Link is below for his letter. They are currently testing in Australia, as well. Also some health-care workers are taking this as a precautionary preventive measure, but I don't know anything about how effective that would be.
Link: https://docs.google.com/document/u/2/d/1SesxgaPnpT6OfCYuaFSwXzDK4cDKMbivoALprcVFj48/mobilebasic