Oral Presentation Australian Society for Microbiology Annual Scientific Meeting 2014

BIOLOGICAL CONTROL OF PATHOGEN INFESTATION ON POST-HARVEST STRAWBERRY FRUITS USING BACTERIOPHAGES (#73)

Dilber Ipek Kurtboke 1 , Amberlee Marker 1 , Christina Neuman 1 , Amy Palk 1 , Mohammad Katouli 1
  1. University Of The Sunshine Coast, MAROOCHYDORE DC, QLD, Australia

Strawberry is a widely-consumed consumed fruit in Australia, mostly without being subjected to disinfection processes, and its surface may harbour pathogenic bacteria due to the nature of the fruit in particular where organic farming practices have been employed. During the harvest season, from May 2011 to November 2011 post-harvest strawberry fruits in the Sunshine Coast region were screened for the presence of enteric bacteria and they were found to carry bacteria in greater numbers if organic amendments are used. Bacterial isolates found on post-harvest strawberries belonged to the genera Escherichia, Enterobacter, Raoultella, Klebsiella, Pantoea, and Citrobacter within the family Enterobacteriaceae. Isolates were shown to colonize human gut epithelial cells as well as carrying virulence factors including toxin genes. Some isolates also displayed antibiotic resistance, mainly against sulphafurazole, cefoxitin and ampicillin. Bacteriophages specific to these bacteria were isolated from various environmental samples and applied directly to post harvest fruits. Significant reduction in enteric bacterial numbers (P≤0.001) was observed after a high titer bacteriophage application, indicating that there might be an alternative biological means of reducing enteric bacteria on post-harvest fruit. The significance of these findings for the industry which is facing public demand for the reduction of synthetic chemical use will be discussed.