Abstract: Disclosed herein are purified bacteriophage preparations that effectively lyse a plurality of Clostridium species strains, in particular C. perfringens, C. septicum and C. difficile. In one embodiment, a purified bacteriophage preparation includes four or more C. perfringens-specific bacteriophage, wherein each bacteriophage has lytic activity against at least five Clostridium species strains. In another embodiment, the purified bacteriophage preparation includes five or more C. perfringens-specific bacteriophage. The invention also relates to the use of purified bacteriophage preparation in combination with antibiotics for the treatment of animals including poultry. The invention also relates to the use of the purified bacteriophage preparations as treatments effective against antibiotic-resistant strains of Clostridium.