TABLE 1.
Cefsulodin concn (μg/ml) | EOPa | Cells | Colonies |
---|---|---|---|
0 | ≡1.0 | Rods | Nonmucoid |
10 | 0.92 | Rods | Nonmucoid |
30 | 0.62 | Spheres | Mucoid |
100 | 0.10 | Spheres | Mucoid |
200 | 0.001 | Spheres | Mucoid |
EOP compared to the titer on an M plate without cefsulodin. Overnight cultures in liquid M medium were diluted and spread on the surfaces of M plates containing cefsulodin at the indicated concentrations. Plates were incubated for 24 h at 30°C.