In our study, immersion treatment in 400 ppm PAA followed by surface treatment with phage nearly eliminated
Salmonella on chicken skin. It has been reported that 200 ppm peroxyacids are
reduced to below detectable levels (1 ppm) on the poultry carcasses
immediately after their application (FAO, 2014). This can be a reason
for the PAA not able to exert its viricidal activity on the phages during
sequential application which in effect will allow the phages to act on
thebacteria producingthesynergistic effect. Natural levels of Salmonella
spp. in post chill chicken carcasses are found to be less than 3 log units
(Brichta‐Harhay et al., 2008; Dufrenne et al., 2001). All these data
suggest that sequential application of phage with PAA can eliminate
the natural level of Salmonella. The baseline survey conducted by the
USDA in 2012 found out that 26.3% of chicken parts were positive for
Salmonella (USDA-FSIS, 2012), so poultry processors need additional
and/or novel approaches during processing to reduce the
Salmonella contamination on poultry parts. The results from our study indicate
that dip treatment in PAA followed by surface treatment with bacterio-
phage can produce high reductions (2.5 log CFU/cm2) of Salmonella,
which can be of use for the industry to treat cut up parts in reducing
Salmonella contamination.
In our study, immersion treatment in 400 ppm PAA followed by surface treatment with phage nearly eliminatedSalmonella on chicken skin. It has been reported that 200 ppm peroxyacids arereduced to below detectable levels (1 ppm) on the poultry carcassesimmediately after their application (FAO, 2014). This can be a reasonfor the PAA not able to exert its viricidal activity on the phages duringsequential application which in effect will allow the phages to act onthebacteria producingthesynergistic effect. Natural levels of Salmonellaspp. in post chill chicken carcasses are found to be less than 3 log units(Brichta‐Harhay et al., 2008; Dufrenne et al., 2001). All these datasuggest that sequential application of phage with PAA can eliminatethe natural level of Salmonella. The baseline survey conducted by theUSDA in 2012 found out that 26.3% of chicken parts were positive forSalmonella (USDA-FSIS, 2012), so poultry processors need additionaland/or novel approaches during processing to reduce theSalmonella contamination on poultry parts. The results from our study indicatethat dip treatment in PAA followed by surface treatment with bacterio-phage can produce high reductions (2.5 log CFU/cm2) of Salmonella,which can be of use for the industry to treat cut up parts in reducingSalmonella contamination.
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