County officials are also investigating whether a dozen of the cases are tied to doughnuts the store provided to nearby businesses.
Commenting on the outbreak, Health Commissioner Eric Zgodinski, of the Toledo-Lucas County Public Health Department met with the media on Thursday and said that the Mama C's Donuts & Coffee in Maumee, OH has been closed.
Norovirus infection is characterized by nausea, vomiting, watery diarrhea, abdominal pain, and in some cases, loss of taste.
Three of the specimens from the restaurant tested by the health department came back positive for norovirus, according to WTOL.
Norovirus is spread through contact with infected individuals or through contaminated food prepared by a person who is now or was recently ill. She said, "We feel sorry about it". All had similar symptoms and had eaten food from the shop between August 4 and Tuesday, health department officials said.
"Like the Health Department said, some customer could be sick and touch the counter", the employee said according to the 13abc report.
The restaurant voluntarily closed for cleaning on August 8. An affected person could still spread the virus even two weeks after the symptoms go away.
Norovirus, sometimes referred to as the winter vomiting bug in the United Kingdom and Ireland, is the most common cause of viral gastroenteritis in humans.
Symptoms typically present itself 24 to 48 hours after exposure to the virus and may last for one to two days.
The health department will reportedly inspect the joint once the cleaning is done and the joint can only resume operations if the officials give them a green signal to go ahead with it.
Kelly Walkup, who did not get sick despite eating doughnuts from Mama C's just a day before the news broke out, also plans to return.
"People are pretty quick to shame them, but it can happen anywhere".
'I think it's super unfortunate. Most people recover in a few days, but it can be unsafe for young children or elderly people.
'I clean, but my goodness, my house could be carrying a virus for all I know with the people coming in and out, touching things'.