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OVERLAND PARK, Kan. -- The Kansas Department of Health and Environment is working with the Kansas Department of Agriculture and the Johnson County Dept. of Health and Environment to investigate an outbreak of norovirus infection among people who attended the New Theatre Restaurant, 9229 Foster Street, in Overland Park on Sunday, Jan. 17.

Norovirus is a very contagious virus with symptoms of diarrhea, vomiting, nausea and stomach pain.

According to a news release from the health department, there were two performances on Jan. 17 and so far more than 390 individuals who attended those performances have reported getting sick.

FOX 4's Dave D'Marko spoke with Rob McGraw, the restaurant's vice president of marketing and sales, who believes someone brought the virus into the restaurant who had been ill before attending a show that Sunday. McGraw does not believe the outbreak is related to food preparation, but a thorough cleaning of both the kitchen and theater has been done as a precaution.

“We completely cleaned the whole place but since we are fairly certain it was one guy that’s the whole story,” McGraw said.

Furthermore, no staff members have fallen ill, nor have any other guests reported getting sick outside of those on Jan. 17. The theater, dining area, and kitchen were open Wednesday night. The Out of Order signs around the theater were advertising the play running through February.

"It could have been the food that was contaminated I don’t know, I’ll just be careful what I eat and wash my hands a lot,” theater-goer Marilyn Thomas said.

“That seems like a lot of people to be affected by one person coming in from outside,” a patron named Sheral said on her way into the theater.

KDHE has not had any reports of illness from people attending the theatre any other day. Through lab work, investigators were able to determine that four people who became ill have confirmed cases of norovirus.

KDHE continues to investigate the outbreak. In order to determine the extent of the outbreak and hopefully identify the source, they are conducting a secure and confidential online survey. That survey was initially only for people who attended a performance that day, but since has expanded to anyone who visited the theater since Jan. 16. People who have already been interviewed by the health department by phone do not need to complete this survey.

The online survey is available by clicking here.

Anyone with questions about the outbreak may call 1-877-427-7317- the KDHE Epidemiology Hotline.