An epizootic of Salmonella typhimurium var. copenhagen in broilers and the use of cultured chicken interestinal flora for its control.

1. An epizootic caused by Salmonella typhimurium var. copenhagen and occurring on the farms of one company was examined with the following factors in mind: the spread of the epizootic, the infection rate of the flocks and the role of the food, hatchery and parent stock. 2. A microbiological technique was used the aim of preventing infection on the farms. 3. The method of control was not as effective the field as in the laboratory; the possible reasons for this are discussed.