Partygoers who attended a fundraiser for the Pelham Picture House at the Hilton Westchester last weekend have come down with an intestinal ailment that causes vomiting and diarrhea, health officials said Friday.

At least 100 people were sickened by what officials think was a norovirus. The number of victims could rise as the county Department of Health continues its investigation, a spokeswoman said. One person was hospitalized.

It was not immediately clear if all victims attended the Pelham Picture House dinner Saturday or if some were at other hotel functions. Picture House officials referred questions to the hotel.

Among the guests were actress Isabella Rossellini and Benh Zeitlin, director of the Academy Award-nominated film “Beasts of the Southern Wild.”

State Sen. Jeffrey Klein, D-Bronx, attended part of the black-tie event, and didn’t get sick, but did say, The Rye Brook outbreak “shows the need for letter grades for food establishments in the county similar to those in New York City.”

Klein wrote a 2008 report titled “Restaurant that are enough to make you sick: An analysis of unsanitary conditions at New York City and Westchester County restaurants.”