Twin Trees Too, a popular Syracuse, New York restaurant, will be undergoing a serious cleaning over the next 18 hours, as the number of customers with norovirus is now up to 70.

The health department says there’s no evidence the bug is still being spread, but as a precaution, the restaurant is voluntarily closing for the first half of the day on Wednesday so Serve-Pro can come in and do a thorough cleaning.

The Onondaga County Health Department suspects the norovirus – or stomach bug – was spread in the restaurant sometime around the last weekend of February and was likely caused by sick employees preparing food.

While the restaurant is well known for its pies, it may have been some other foods that were contaminated.

"The investigation is still pending, but we do think that it’s more likely to be related to a salad or antipasto than to the pizza at this time,” said Onondaga County Health Commissioner, Dr. Cynthia Morrow.