TABLE 1.
Inhibitory activity of E. coli O104:H4 in competition assays with selected Enterobacteriaceae indicator strains
| Indicator strain | Serotype | Collection no. | Source | Inhibition zonea |
|---|---|---|---|---|
| Escherichia coli | O157:H7 | E135 (EDL933; ATCC 43895) | Meat (burger) | +++ |
| O157:H7 | E118 | Bovine feces | ++ | |
| O157:H7 | E141 | Apple cider | ++ | |
| O157:NM | E963 | Human feces (HUS) | ++ | |
| O157:NM | E148 | Human feces (HUS) | ++ | |
| O26:H11 | E157 | Human feces (HUS) | ++ | |
| O26:H11 | E165 | Calf feces | + | |
| O26:H11 | E972 | Wild boar meat | ++ | |
| E162 | Ice cream | +++ | ||
| E163 | Smear cheese | + | ||
| E164 | Raw milk | +++ | ||
| Salmonella enterica subsp. enterica | Typhimurium | S509 | Swab (meat plant) | − |
| Typhimurium | S692 | Bovine feces | − | |
| Typhimurium | S702 (ATCC 14028) | Heart/liver tissues (chicken) | − | |
| Enteritidis | S522 | Mettwurst sausage | − | |
| Enteritidis | S575 | Lymphatic tissue (pig) | − | |
| Enteritidis | S630 | Meat juice | − | |
| Citrobacter freundii | Ci5 | Bovine feces | − | |
| Ci24 | Chicken meat | − | ||
| Ci29 | Dry cured ham | − | ||
| Hafnia spp. | NE146 | Teewurst | − | |
| NE137 | Swab (meat plant) | − | ||
| NE142 | Meat | − | ||
| Klebsiella oxytoca | Kl31 | Ground meat | − | |
| NE226 | Human feces | − |
a
Results of three experiments in a duplicate setup are presented. Diameters of inhibition zones were calculated and are indicated as +++ (>15 mm), ++ (15 to 10 mm), or + (10 to 5 mm); −, no inhibition activity.