FIG. 2.

Bacterial cell numbers of O157 in NaCl water. Colony counts of roe-originating O157 strains 2 (⧫), 3 (▴), and 4 (■) and patient-originating O157 strains 5 (×), 6 (+), 7 (□), and 8 (○), which were incubated in 13% (A) and 7% (B) NaCl water, were determined on TSA plates.