Panera's Reopened

Panera's had shut down for a few days due to a staff member, I believe, testing positive for COVID-19 but has reopened. Seems a lot of that going around. I can see shutting down to test staff members for infection but the deep cleaning, from what I have read, seems not particularly useful, since the virus transmits through the air rather than from touching items that someone else has touched. 

In addition, most of the cleaning appears to focus on killing germs, using disinfectants and sanitizers, which do very little against a virus. Of course, someone with more medical expertise than I is certainly welcome to correct me.