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Bactenophage are viruses that prey on bacteria and may be a potential strategy to reduce foodborne pathogemc bactena in the gastromtestlnal tract of food ammals Phages are fa1rly common m the gastrointestinal m1crob1al ecosystem of mammals, but the incidence is unknown. If phage are to be an intervention strategy, we must understand the1r role in the m1crobial ecology of the gut From a regulatory perspective, knowmg mc1dence of phage 1s cruc1al Therefore the current study was designed to determine the incidence of phage active against Salmonella spp 1n the feces of commercial finishmg swine m the Umted States Fecal samples (n=60) were collected from each of s1x commerc1al swme fimshmg operations Samples were collected from 10 randomly selected pens throughout each operation Total number of fecal samples collected m th1s study was n=360 Salmonella spp were found 1n 6 6% of the fecal samples Salmonella spp. were ISOlated from only 2 farms and the serotypes represented were Schwarzengrund, Anatum, Ohio and Heidelberg Bacteriophages were isolated from fecal sample through 2 parallel methods, 1) in1tlal enrichment m Salmonella Typh1munum, or 2) 1n1t1al ennchment 1n E. colt B (a stram very sensitive to phages), followed by direct spot-testing against Salmonella Typhimurium Bactenophages active against Salmonella Typhimunum were Isolated from 1 1% (4/360) of the individual fecal samples when initially enriched m Salmonella Typhimurium, but E coli S-killing phages were 1solated from 43.8% (158/360) of the fecal samples but only 2 of these Isolates were capable of k1ll1ng Salmonella Typhimunum. Our results mdicate that bactenophage capable of killing Salmonella Typh1murium are fairly w1despread across commercial swine production facilities but may be present at relatively low populat1ons These results md1cate that phage (predator) populations may vary along w1th Salmonella (prey) populations and that phage could potentially be used as a food safety pathogen reduction strategy

Isolation of Salmonella spp. and bacteriophage active against Salmonella spp. from commercial swine