The Princeton Health Department concluded an investigation of Nassau Inn following reports of illness from Thanksgiving diners, the Times of Trenton reported.

Town health officer Jeffrey Grosser said that norovirus is suspected in the majority of reported cases due to the nature of the symptoms and rapid onset of illness, although the department has not obtained confirmed lab specimens from the ill diners.

Officials collected information from 53 customers whose symptoms included vomiting and diarrhea.

As part of the investigation, the department examined the hotel’s practices for heating food, refrigeration and cleaning. Health officers conducted interviews with employees and reminded them to wash their hands, sanitize touchable surfaces and remain home from work if they felt sick.