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Reduction Of Experimental Salmonella And Campylobacter Contamination Of Chicken Skin By Application Of Lytic Bacteriophages

D. Goode, V. M. Allen, P. A. Barrow

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ABSTRACT Lytic bacteriophages, applied to chicken skin that had been experimentally contaminated with Salmonella enterica serovar Enteritidis or Campylobacter jejuni at a multiplicity of infection (MOI) of 1, increased in titer and reduced the pathogen numbers by less than 1 log 10 unit. Phages applied at a MOI of 100 to 1,000 rapidly reduced the recoverable bacterial numbers by up to 2 log 10 units over 48 h. When the level of Salmonella contamination was low (< log 10 2 per unit area of skin) and the MOI was 10 5 , no organisms were recovered. By increasing the number of phage particles applied (i.e., MOI of 10 7 ), it was also possible to eliminate other Salmonella strains that showed high levels of resistance because of restriction but to which the phages were able to attach.