WOODBURY — Washington County officials are investigating a norovirus outbreak that infected at least 30 people at a family restaurant in Woodbury.

Several patrons reported stomach illnesses last weekend after visiting the same Chuck E. Cheese location. The Washington County Public Health Department has since interviewed about 60 people and says half of them have reported getting sick.

An epidemiologist for the department says it has determined about 1,000 people were at the restaurant last weekend. The department is still trying to determine the cause of the virus, how it spread and how many people were infected.