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The aim of this study was to phenotypically and genotypically identify coagulase-negative  Staphylococcus  (CoNS) recovered from the nostrils of waste workers and from dental waste; 135 strains were recovered and  S. epidermidis  was the prevailing species. Genetic similarity (100%) was observed between the two  S. epidermidis  isolated from different employees on the same shift and 85% similarity between the  S. epidermidis  recovered from an employee’s nostril and from waste. The  mecA  gene was found in 20 CoNS, and 20% were also found to possess the  vanA  gene. The  blaZ  gene was detected in 46.7%, and the  ica A (34.8%), B and C genes (11.8% each). Our findings emphasized the biological risk to which waste workers are exposed and unprecedently confirms that it was possible to recover genetically identical bacterial species from waste and from workers’ nostrils. It is important to highlight that this risk is raised by the detection of relevant antimicrobial resistance genes. The results also suggest that effective measures to correctly manage waste and promote the rational use of antimicrobials should be adopted.

international journal of environmental health research

Evidence of cross-contamination of waste workers and transmission of antimicrobial resistance genes by coagulase-negative                      S taphylococcus  isolated from dental solid waste: an intriguing study