Some officials take precautions after COVID-19 confirmed in the White House

How dangerously foolish is Trump?  All it takes is one false negative test of anyone on his staff and they will come into the office and begin spreading viruses everywhere.  Leaving them on hard surfaces where they can live for 72 hours or more and on paper where they can last for hours.  Trump could get infected two to three days after the infected person was even detected.  So, just how stupid and dangerous is Trump's vanity refusal to wear ppe?