Investigators can find no evidence of bacteria in the food which is suspected of causing the recent outbreaks of gastric disorders at Adams House and the Union, John C. Morris, Sanitary Inspector to the University Health Service, reported yesterday. He emphasized, however, that the findings did not rule out the possibility of an actual disease.

Morris said the foods most likely to be infected are creamy ones, such as gravy, dressings, and custards.

The fact that the Union does not retain leftovers hampers the investigations. Officials will distribute questionnaires among freshmen at lunch today in an effort to track down the cause of the epidemic.

Although most victims believe that their illnesses resulted from eating supper at the Union that day, Morris revealed that some students became sick before then. His department will launch a month-long inspection of sanitary conditions in the Union shortly.