Any business can have a crisis, which can drive away customers if it's handled poorly.
Here are some true stories. A small catering company learned that an employee had come down with hepatitis, a contagious liver disease that can be spread by food handlers. But the company managed the situation well. First they ensured that the employee had medical care, they had their entire staff tested, and they had their kitchen and equipment professionally disinfected. They alerted their most recent customers, telling them what symptoms to watch for.