Impact of the source of organic manure on persistence of E. coli O157:H7 gfp + in rocket ( Diplotaxis tenuifolia ) and Swiss chard ( Beta vulgaris cicla)

The influence of organic nitrogen sources on the establishment of E. coli O157:H7 and the occurrence of other potentially human pathogenic bacteria on baby leaf salads was evaluated. Greenhouse-grown rocket and Swiss chard were spray-inoculated with gfp-tagged E. coli O157:H7 twice a week from when their first true leaves reached a length of 2 cm until three days before harvest. Analysis of nitrogen content in leaves revealed differences between...