NOVELTY - Phage isolate (I) with substantial lytic potential towards Enterobacter sakazakii is new.    USE - (I) is useful as disinfectant in food or for sanitation of factory environment. (I) or cocktail is useful for decontamination of food products and sanitation of factory environment. (I) is useful in the preparation of a composition intended to prevent or treat infections caused by E. sakazakii in humans or animals (all claimed). (I) is useful as anti-microbial agents in food products (particularly in infant formula) and for sanitation of factory environments. The ability of phage cocktail to inhibit the growth of Enterobacter sakazakii was tested using biological assays. The results showed that the bacterial mixture grown out to high number in the absence of phage cocktail whereas no growth was observed in the presence of the phage cocktail for a period of minimum 6 hours and up to 24 hours.    ADVANTAGE - (I) has a strong lytic activity against Enterobacter sakazakii. (I) provides an agent to disinfect, clean and decontaminate working surfaces or processing equipment in factories, as well as floors and walls and is environmentally safe and nontoxic for humans.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (a) a food product containing at least one (I) or cocktail with substantial lytic potential towards Enterobacter sakazakii;    (b) a phage cocktail containing at least one (I), which infects at least 80% of E. sakazakii strains (FSM-16; FSM-33; FSM-261; FSM-265; FSM-266, FSM-269; FSM-270; FSM-271; FSM-272; FSM-273; FSM-274; FSM-280; FSM-281; FSM-284; FSM-286; FSM-288; FSM-290; FSM-292; FSM-297; FSM-298; FSM-300; FSM-303; FSM-305; FSM-308; FSM-309; FSM-311; FSM-313; FSM-314; FSM-316; FSM-318; FSM-322; FSM-323; FSM-1360; FSM-1387-2NL; FSM-MC7; FSM-MC8; FSM-MC9; FSM-MM10 or FSM-MM11);    (c) an agent for decontamination of food product by prevention of contamination and outgrowth of E. sakazakii and sanitation of factory environment, which comprises at least one (I) or cocktail; and    (d) selection of (I) with substantial lytic potential towards E. sakazakii consisting of screening (I) having the ability to infect:    (i) at least 9 bacterial strains of E.sakazakii (FSM-16; FSM-33; FSM-261; FSM-265; FSM-266, FSM-269; FSM-270; FSM-271; FSM-272; FSM-273; FSM-274; FSM-280; FSM-281; FSM-284; FSM-286; FSM-288; FSM-290; FSM-292; FSM-297; FSM-298; FSM-300; FSM-303; FSM-305; FSM-308; FSM-309; FSM-311; FSM-313; FSM-314; FSM-316; FSM-318; FSM-322; FSM-323; FSM-1360; FSM-1387-2NL; FSM-MC7; FSM-MC8; FSM-MC9; FSM-MM10 or FSM-MM11) in a test on solid medium using the spot assay test; and    (ii) at least 9 bacterial strains of E.sakazakii (FSM-16; FSM-33; FSM-261; FSM-265; FSM-266, FSM-269; FSM-270; FSM-271; FSM-272; FSM-273; FSM-274; FSM-280; FSM-281; FSM-284; FSM-286; FSM-288; FSM-290; FSM-292; FSM-297; FSM-298; FSM-300; FSM-303; FSM-305; FSM-308; FSM-309; FSM-311; FSM-313; FSM-314; FSM-316; FSM-318; FSM-322; FSM-323; FSM-1360; FSM-1387-2NL; FSM-MC7; FSM-MC8; FSM-MC9; FSM-MM10 or FSM-MM11) in liquid medium.