Salmonella contamination of swine and morbidity rates among the workers of swine-breeding complexes and the members of their families, as well as among the population inhabiting the zone of possible influence rendered by such complexes on the environment, have been studied as exemplified by 4 complexes for large-scale swine breeding, differing in their technology of swine raising and fattening, their systems of the purification and utilization of manure-containing sewage. Besides, the influence of the raw meat (pork) and meat products, contaminated with salmonellae, sold in town, on salmonellosis morbidity among the urban population has been analyzed. The study has revealed that salmonellae are spread from swine-breeding complexes with the fluid and solid fractions of manure-containing sewage, as well as with the animals supplied to the meat-packing plant; the contamination of the workers of swine-breeding complexes with salmonellae becomes possible due to the low culture of the production and to the breach of sanitary and epidemic-control regulations and the contamination of the population occurs through meat and meat products.