Question for office folks re: Corona

Work in a large corporate office building. One of the employees went home sick last week, running fever, his girlfriend also works in same building and is in her office as we speak. Working from home now but plans on coming back Thursday. Had flu test that came back negative but no Corona test, still running fever. What plan does your company have in place to address something like this? Should he be forced to have the Corona test come back negative prior to returning to work?