What do people at the bakery think is wrong with Charlie to cause him to take time off work?

The people at the bakery simply believe that Charlie is sick. Professor Nemur does not want them to know that Charlie is having an operation.

Joe Carp from the bakery brot me a chokilat cake from Mr Donner and the folks at the bakery and they hope I get better soon. At the bakery they .think Im sick becaus thats what Prof Nemur said I shoud tell them and nothing about an operashun for getting smart.