Cadmium Resistance of Food-borne Listeria monocytogenes and the Relationships between Cadmium Resistance and Antibiotic Resistance

To determine the prevalence of cadmium resistance among food-borne Listeria monocytogenes isolates of different serotypes and to know whether there are possible associations between cadmium resistance and antibiotic resistance of these isolates,all isolates were tested for their resistance to cadmium by agar dilution method.Results showed that,among 73 isolates,36 cadmium-resistant strains were detected,the overall resistance ratio was 49.3%(36/73).Besides,the 5 multidrug resistant strains isolated in this study were all resistant to cadmium,indicating that in case of the involvement of Listeria monocytogenes with both cadmium and multidrug resistance in human disease,through food chains or environmental factors,the human health should be seriously threatened.