PARDEEVILLE, Wis. (AP) -- Wisconsin health officials say norovirus is the likely cause of an illness that struck more than 60 campers in Pardeeville last weekend.

About 700 people attended the annual Wet and Wild weekend at the Pride of America Campground.

Campground manager Mike Hagen says dozens began dry heaving and suffered stomach cramps Saturday night. He began getting reports of sick children on Sunday morning.

Hagen says most of the children had been swimming in Lake George.

Columbia County health department director Erik Pritzl says officials are working to confirm the outbreak was cause by norovirus.

The highly contagious, 24-hour virus causes flu-like systems including nausea, vomiting and diarrhea. It can be spread through drinking or recreational water.