GSE markedly inhibited bacterial growth of non-O157 STEC at low inoculation level.
At high inoculation level, GSE reduced quorum sensing of all non-O157 STECs tested.
GSE reduced swimming motility of all the top-six non-O157 STECs.
GSE reduced flagella and Shiga toxin contents of E. coli O103:H2 and O111:H2.