According to federal health officials reports a single employee of a sandwich chain joining work early after suffering from a stomach virus infected more than 100 office workers who ate party-sized submarine sandwiches last year.
The cause of infection as per the U.S. Centers for Disease Control and Prevention was a a norovirus passed on to three separate office parties in Kent County, Michigan in May last year.
The CDC repots reads as follows, "Illnesses at a publishing company, school, social service group, and among members of the public resulted in closure of a warehouse, employee absences, pay for substitute teachers, loss of wages, and loss of revenue to the restaurant during a week-long closure. The three outbreaks and community cases all appeared to have been linked to sandwiches prepared by the same restaurant."
Noroviruses are the most common cause of stomach illness causing vomiting and diarrhea, as well as other symptoms. They are easily passed on by people who do not wash their hands properly and can cause outbreaks in restaurants, cruise ships and other large gatherings.
As a precautionary measure people who have been sick with a stomach virus should not return to work until they have been well for at least a day and the new Michigan rules stipulate that sick workers stay home for 48 to 72 hours after their symptoms end.
All this is to save people from contracting and spreading infections.