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Chlorine combination survival. Exponentially growing M.fortuitum strain 4G and E. coli O157:H7 strain Sakai were mixed into deionized water with 1, 2, 4, or 8 ppm of free chlorine added. Viability was determined as in Fig. 3. E. coli is only indicated at 1 ppm because no colonies were obtained at higher chlorine concentrations.
