Group foodborne salmonellosis infection in adults

We observed a group nosocomial disease of salmonellosis caused by S. typhimurium. The source was a cook with a subclinical form of this infection. 18 adults fell ill 13 patients from one department, 4 employees of the same department and a cook of the food block. The first cases of the disease appeared 4 hours after lunch, the subsequent ones - after 30 hours. In 14 patients, the incubation period ranged from 4 to 12 hours, in the rest the incubation period could not be established.