Prevalence of resistance to cadmium, BC, and arsenic among isolates of L. monocytogenes of different serotypes from the environment of turkey-processing plants. Resistance and susceptibility were determined as described in Materials and Methods. Cd-R, cadmium resistant; BC-R, BC resistant; As-R, arsenic resistant; Cd-R, BC-S, resistant to cadmium but susceptible to BC; Cd-R, BC-R, resistant to both cadmium and BC.