Abstract
Anthropogenic contamination of coastal-marine water is responsible for introducing multidrug-resistant bacteria such as the pNDM-harbouring Escherichia coli into the seafood chain. This study was conducted to understand the survivability of a multidrug-resistant, the New Delhi Metallo-β-lactamase-producing E. coli (AS-EC121) in tropical seawater at room temperature (28–32 °C) compared to E. coli K12 strain. The experimental and control strains were inoculated at 6 log CFU/ml level into seawater. After an initial sharp decline in counts, AS-EC121 and K12 strains showed a gradual loss of viability after week-1 of inoculation. AS-EC121 was undetectable after day-56, while K12 colonies disappeared a week later, from day-63. The conjugation experiment revealed that pNDM was transferable to a recipient E. coli strain in seawater. This study suggests that the multidrug-resistant, pNDM-harbouring E. coli is able to survive in seawater for over 2 months stably maintaining the resistance plasmid. The resistance genotypes do not seem to compromise the survivability of MDR E. coli and the stability of plasmid provides ample opportunities for dissemination of plasmids among co-inhabiting bacteria in the coastal–marine environments.
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The authors thank the Director, ICAR-CIFE Mumbai for providing the necessary facilities for carrying out this work. SM is grateful to the Indian Council of Agricultural Research (ICAR), New Delhi for a Junior Research Fellowship (JRF) during M.F.Sc programme.
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Mukherjee, S., Lekshmi, M., Ammini, P. et al. Survival of the blaNDM-harbouring Escherichia coli in tropical seawater and conjugative transfer of resistance markers. Arch Microbiol 203, 4273–4279 (2021). https://doi.org/10.1007/s00203-021-02411-6
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DOI: https://doi.org/10.1007/s00203-021-02411-6