Antibiotic-Resistant Organisms Cultured from Atlantic Bottlenose Dolphins (Tursiops truncatus) Inhabiting Estuarine Waters of Charleston, SC and Indian River Lagoon, FL |
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| Authors: | Adam M Schaefer Juli D Goldstein John S Reif Patricia A Fair Gregory D Bossart |
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| Institution: | (1) Harbor Branch Oceanographic Institute at Florida Atlantic University, 5600 US 1, North, Ft. Pierce, FL 34946, USA;(2) Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO, USA;(3) Center for Coastal Environmental Health and Biomolecular Research, NOAA, NOS, Charleston, SC, USA;(4) University of Miami, Miller School of Medicine, Miami, FL, USA |
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| Abstract: | Bottlenose dolphins (Tursiops truncatus) from estuarine waters of Indian River Lagoon, FL (IRL) and Charleston, SC (CHS) were cultured to screen for microorganism
colonization and to assess antibiotic sensitivity. Swabs (n = 909) were collected from the blowhole, gastric fluid, and feces
of 171 individual dolphins The most frequently cultured organisms were Plesiomonas shigelloides (n = 161), Aeromonas hydrophila (n = 144), Escherichia coli (n = 85), and Pseudomonas fluorescens (n = 82). In descending frequency, organisms demonstrated resistance to erythromycin, ampicillin, and cephalothin. Human
and animal pathogens resistant to antibiotics used in human and veterinary medicine were cultured. Escherichia coli (E. coli) more often was resistant in IRL dolphins. Three cases of methicillin-resistant Staphylococcus aureus (MRSA) were found at CHS. Emergence of antibiotic resistance is not confined to humans. Bottlenose dolphins may serve as
sentinels for transfer of resistance from humans and animals or indicate that antibiotics are reaching the marine environment
and causing resistance to emerge through selective pressure and genetic adaptation. |
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