The Bacto-Rodenticide BT preparation is a biological agent intended for controlling rodents. It contains the active ingredient Salmonella enteritidis var. Issatschenko L-28 at a concentration of 2 billion IU/g and is produced in the form of grain bait. The preparation is used in agricultural fields, meadows, gardens, greenhouses, warehouses, and farms to protect against rodents. It is used as a poisoned bait, enabling effective control of rodent population levels in the specified areas.