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Salmonella enterica serovar Enteritidis and Salmonella enterica serovar Typhimurium are major foodborne pathogens of concern worldwide. Bacteriophage applications have gained more interest for biocontrol in foods. This study isolated 36 Salmonella phages from several animal farms in Thailand and tested them on 47 Salmonella strains from several sources, including farms, seafood processing plant and humans in Thailand and USA. Phages were classified into three major groups. The estimated phage genome size showed the range from 50 ± 2 to 200 ± 2 kb. An effective phage cocktail consisting of three phages was developed. Approximately 4 log CFU/mL of S. Enteritidis and S. Typhimurium could be reduced. These phages revealed a burst size of up to 97.7 on S. Enteritidis and 173.7 PFU/cell on S. Typhimurium. Our phage cocktail could decrease S. Enteritidis on chicken meat and sunflower sprouts by 0.66 log CFU/cm² and 1.27 log CFU/g, respectively. S. Typhimurium on chicken meat and sunflower sprouts were decreased by 1.73 log CFU/cm² and 1.17 log CFU/g, respectively. Overall, animal farms in Thailand provided high abundance and diversity of Salmonella phages with the lysis ability on Salmonella hosts from various environments and continents. A developed phage cocktail suggests a potential biocontrol against Salmonella in fresh foods.

microorganisms

Lysis Profiles of Salmonella Phages on Salmonella Isolates from Various Sources and Efficiency of a Phage Cocktail against S. Enteritidis and S. Typhimurium