TABLE 1.
Production of ECC by E. coli O157:H7 strains 43895-EPS, ATCC 43895-, and 43895+ on a per-cell biomass basis as affected by growth medium and temperature
| Medium | Strain | Amt of ECC (μg/ml)a at:
|
|
|---|---|---|---|
| 22°C | 12°C | ||
| HLJA | 43895-EPS | a 1,402 b | a 2,676 a |
| ATCC 43895- | b 103 a | b 152 a | |
| ATCC 43895+ | b 83 b | b 136 a | |
| mTSA | 43895-EPS | a 135 b | a 289 a |
| ATCC 43895- | b 66 a | b 55 a | |
| ATCC 43895+ | c 39 b | b 121 a | |
a
Amount of ECC produced on a per-cell biomass basis. A standard initial population (104 CFU) of E. coli O157:H7 was inoculated onto each plate and was incubated at 22°C for 3 days or 12°C for 5 days. Values represent the amount of ECC present in suspension at an optical density at 750 nm of 1.0. Within a medium and temperature, values in a column that are not preceded by the same letter are significantly different (P ≤ 0.05). Values in the same row that are not followed by the same letter are significantly different (P ≤ 0.05).